Optimizing seed crops of common bent (Agrostis capillaris) by sowing rate

Abstract

As part of a project to stimulate Norwegian seed production of common bent (syn. browntop, US: colonial bentgrass, Agrostis capillaris L. syn. A.tenuis Sibth.) field trials comparing sowing rates of 2.5, 5.0, 7.5 or 10 kg ha^?1 were conducted at Landvik, south-east Norway, (58°N) from 1989 to 1994. Three trials were laid out of the forage cultivar ‘Leikvin’ and three trials of the lawn cultivar ‘Nor’, each trial being harvested for three consecutive years. While the average per cent ground cover in spring increased from 87% at 2.5 kg ha^?1 to 94–96% at 7.5 kg ha^?1, seed yields decreased with increasing sowing rate in both cultivars. On average for all harvests, quadrupling the sowing rate from 2.5 to 10 kg ha^?1 reduced seed yield by 9% in ‘Leikvin’ and 15% in ‘Nor’, the stronger effect probably being associated with a greater competition between tillers in the lawn cultivar. Seed yield reductions with increasing sowing rate showed no relationship with crop age, but were less accentuated for crops undersown in spring wheat in a dry year than for crops established without cover crop in years with ample rainfall in early summer. Increasing sowing rates reduced plant height and panicle number in ‘Nor’, but had no effect on seed weight or germination in any of the cultivars. It is concluded that seed crops of common bent should be established with a sowing rate of 2–5 kg ha^?1, with the lowest rate in lawn cultivars, under ideal seedbed conditions and when seed crops are sown without cover crop.     

Effects of tillage, seeding method and time of sowing on the establishment of mungbean in drying, previously puddled soil

Two field experiments were conducted on small plots in the Philippines to determine the effects of tillage, seeding method and time of sowing on the establishment of mungbean (Vigna radiata (L.) Wilczek cv. IPB-M79-17-79) in seedbeds created in drying soil that had been puddled as for an immediately preceding wetland rice crop.

Conditions following rice were simulated by flooding, puddling and then draining the plots. Mungbean was sown at 2–14 days after draining (DAD) as the soil dried. In one experiment, seeds were sown manually into plots that were either non-tilled or for which the surface 10 cm had been ploughed and harrowed. In a second experiment, manual sowing into non-tilled plots was compared with prototype machine seeding. Soil matric potential and temperature were monitored throughout the experiments, and germination and seedling emergence recorded.

Surface cultivation slowed the rate of water loss from depths below 5 cm and resulted in lower thermal diffusivity than in non-tilled soil. Germination results indicated that following drainage of a seedbed in previously puddled soil, manual sowing at a depth of 5 cm could be delayed until 8 DAD (while soil matric potentials remained > − 0.1 MPa) without a significant reduction in seed germination. The seeding machine was quicker and easier to use, but its constraint of shallow sowing (maximum depth 2 cm) meant that sowing could be delayed only to 5 DAD before germination and emergence were inhibited. Predictions of germination from measured values of temperature and water potential were made using equations derived from controlled-environment studies. Differences from germination observed could probably be accounted for by seed/soil/water contact effects, which appeared to be especially important in dry soil (< − 0.7 MPa). Subsequent seedling emergence was, however, often severely restricted in non-tilled soil by soil mechanical constraints in the drying, strengthening seedbed. In the first experiment, these conditions were alleviated by the cultivation treatment; in the second, disturbance of surface soil before drainage resulted in greater emergence and faster seedling growth.     

Effects of seedbed properties on crop emergence: 2. Effects of aggregate size,sowing depth and initial water content under dry weather conditions

Abstract

Rapid and uniform crop establishment is a prerequisite for efficient crop production and minimal environmental impact. Extensive experiments were carried out in shallow plastic boxes placed in the field directly on the ground for studies of the effects of seedbed properties on emergence of small-grain cereal crops in a cool, temperate climate. This paper presents studies of the seedbed as a protective layer against evaporation and the requirements for good emergence under dry weather conditions. Without rainfall after sowing, nearly complete emergence of barley (Hordeum vulgare L.) was obtained, when rapidly germinating seed was placed on a moderately compacted basal layer containing at least 5% (w/w) plant-available water and covered by a 4 cm deep surface layer consisting of aggregates < 5 mm. This applied even when initial water content in the surface layer was below the wilting point and potential evaporation was high. If the soil at 4 cm depth is drier or if a sufficiently fine seedbed cannot be obtained, then seedbed and sowing depth should be somewhat greater, and if the soil is wetter, then the depth may be smaller. There were only small differences in emergence between surface layers consisting of aggregates < 2 mm, 2–4 mm or 2–5 mm, or dominated by these aggregate fractions, but when the surface layer consisted of coarser aggregates, emergence was usually much lower. Determinations of water losses from the soil during the experimental period showed that the differences in emergence were caused by differences in efficiency of the seedbed to control evaporation. The results indicate that, in an initially wet soil, it is always possible to find a time and method for seedbed preparation and sowing that lead to good emergence of small-grain cereal crops, even with a lengthy period without rainfall after sowing.     

Effects of seedbed properties on crop emergence. 5. Effects of aggregate size,sowing depth and simulated rainfall after sowing on harmful surface-layer hardening

Abstract

Rapid, uniform crop establishment is a precondition for efficient crop production. In order to develop guidelines for seedbed preparation and sowing, extensive experiments were carried out in plastic boxes placed in the field directly on the ground for studies of the effects of seedbed properties on crop emergence. This paper deals with the effects on emergence of cereals caused by surface-layer hardening, induced by simulated rainfall (irrigation) after sowing followed by dry weather. The experimental crop was spring barley (Hordeum vulgare L.). Soils for the experiments (Eutric Cambisols, silt loam or clay loam in most cases) were collected from the surface layer of farm fields in various parts of Sweden. On soils with high silt content, irrigation after sowing often caused slumping and subsequent hardening of the whole seedbed. On clay soils, usually only a shallow surface crust formed. The earliest irrigation had the most negative effects on crop emergence. On a silt loam soil with unstable structure, irrigation with only 5 mm reduced emergence to under 20%. Later or heavier irrigation was often less negative, as it allowed the plants to emerge before the surface layer dried and hardened. Deep sowing greatly increased the negative effects on emergence, whereas soil aggregate size usually had negligible effects. It was concluded that when sowing in practice, seedbed preparation and sowing depth should be chosen to promote the fastest possible emergence. Sowing immediately before rain should be avoided, as should shallow sowing that requires rain for the seed to germinate.     

Effects of seedbed properties on crop emergence: 3. Effects of firming of seedbeds with various sowing depths and water contents

Abstract

Extensive experiments were carried out in shallow plastic boxes placed directly on the ground in the field to study the effects of seedbed properties on the emergence of various crops in a cool temperate climate. In a group of experiments with barley (Hordeum vulgare L.), we studied the effects on crop emergence of firming (slight compaction) of the seedbed, simulating the recompacting effects of rolling after sowing or press wheels on the seed coulters. Most of the experiments were carried out without irrigation after sowing. The firming usually had a slightly positive effect on emergence when the water content in the surface layer at sowing was below the wilting point. When the water content in the surface layer was higher, firming often reduced emergence drastically, particularly with deep sowing and in coarse-textured soils. The main reason for negative effects was harmful hardening of the surface layer when the more firm seedbed gradually dried out. When irrigation kept the seedbed continuously moist, the negative effect of firming was almost eliminated. Very high initial water content in the basal layer tended to delay surface layer drying and hardening, and to reduce the negative effect of firming. Firming only slightly influenced the evaporative water losses from the soil. In contrast to the results presented here, previous field trials with cereals have usually resulted in more positive effects of rolling after sowing. This indicates that other effects than firming, such as modification of sowing depth and reshaping of the soil surface, are other important effects of rolling.     

Effect of fungicide thiram on microbial communities of rice seed surface estimated by culture-dependent and culture-independent (PCR-RFLP) methods

Coating of rice seeds with fungicide Thiram improved the seed germination capability over a long period of time (11 weeks) under low temperature conditions (4 and 8°C), which simulated the sowing of rice seeds in the winter season (the farmer's slack season). To analyze the effect of Thiram on the community structure of microorganisms on the rice seed surface, culture-dependent and culture-independent (PCR-RFLP) methods were applied. PCR-RFLP patterns of 16S rDNA showed that the bacterial communities on the rice seed surface were different between coated and uncoated treatments under 8°C conditions, but that they were very similar under 4°C conditions. PCR-RFLP patterns of 18S rDNA revealed the remarkable effect of Thiram on the fungal community structure under both 4 and 8°C conditions. Although the fungal communities were quite different between coated and uncoated seeds at the beginning of incubation, the fungal communities on the coated seed surface became similar to those of uncoated seeds along with the duration of the incubation period. As the dominance percentage of Fusarium spp. among the isolates increased with the duration of the incubation period for both coated and uncoated seeds, Fusarium was considered to be a responsible for the poor germination of rice seeds that were sown in the winter season.     

Effect of location on dwarf French bean (Phaseolus vulgaris L.) seed production and seedling vigour

ABSTRACT

This study examined if dwarf French bean (Phaseolus vulgaris L.) grown at northern latitudes develop seeds with superior yielding potential compared with plants grown at more southern latitudes. Two lines (BND3085 and BND3106) were grown at four sites across latitudes ranging from 52°N to 3°S. BND3085 and BND3106 seeds from Saskatoon grown plants (52°N) had the least damaged seed coats but the highest degree of electrolyte leakage from the seed and the lowest maximum germination rates. The Saskatoon (BND3085 and BND3106) and Nunhem (BND3106) seed lots had the lowest maximum germination rates when germinated at 28°C, 12°C, or when exposed to saline (100?mM NaCl) conditions. Saskatoon BND3085 seed produced plants with the lowest aboveground vegetative and total seed dry matter as well as the lowest pod number per plant. In contrast, plants grown from Saskatoon BND3106 seed produced 1.5-fold more total pods, 1.3-fold more total pods and 1.4-fold higher seed dry matter per plant as compared to plants grown from the Nunhem (51°N) or Arusha seed sources. This resulted in a 2.4–4.5% higher harvest index. These results suggest cultivar-specific dwarf French bean seed propagation at more northern sites may increase the productivity of the resulting crop.     

Soybean Seed Aging and Environmental Factors on Seedling Growth

The effect of seed vigor on seed emergence depends on the type of environmental stress present at the time of seed germination and establishment. Therefore, the aim of this study was to assess the interaction of environmental stresses and aging on soybean (Glycine max L.) seed emergence. A factorial arrangement of treatments imposed on a randomized complete block design with four replications was conducted. Treatments of seed aging for 12, 24, 36, and 48 h at 41°C, salinity (6 and 12 ds/m²), water deficiency (–4 and–9 MPa), and sowing at depths of 3 and 7 cm were selected. Growth measurements were completed 21 and 55 days after planting. Analysis of variance was performed using the regression method for quantitative treatments such as seed aging, and if interactions were significant, interaction slicing was utilized and means compared with least significant difference tests (0.05). For quantitative treatments, regression analysis was conducted and path analysis was performed on growth traits. Results showed that aging had a significant effect on maximum emergence and rate of emergence. The ranking of the stress factors from most to least injurious for maximum emergence were severe salinity, severe drought, medium salinity, sowing depth of 7 cm, and medium drought. Harmful stress conditions on the plant leaf area and seedling dry weight were severe salinity, medium salinity, severe drought, medium drought, and sowing depth of 7 cm (only for seedling dry weight). Relative growth rate, net absorption rate, and leaf area ratio were not affected by aging but were affected by environmental conditions. These findings indicate that the impacts of environmental conditions are at least partially controlled by seed vigor.     

Experiments on the effects of seedbed characteristics on seedling emergence in a dry weather situation

A research program concerning the seedbed preparation problems in Swedish agriculture included a series of pot experiments in shallow plastic boxes. Seedbeds of well-defined characteristics were arranged, and seedling emergence was determined by daily plant countings. In the experiments reported, the main subject of study was the efficiency of the seedbed in controlling evaporation. Clay or clay loam soils were used, and the crops were mainly small grain cereals.Seven experiments with unstratified seedbeds showed that for small grains in a dry weather situation, the seed should be placed directly onto the moist bottom of a harrowed layer, which should be 4–5 cm deep and mainly consist of aggregates smaller than 4 mm. If the bottom layer contains less than 5% plant available water, or if a fine enough seedbed structure cannot be produced, the depth of both harrowing and sowing should be increased. In four experiments with stratified seedbeds, no reasons were found for sorting the coarse aggregates to the soil surface, provided the initial moisture content increased with depth.Effects of seed quality were studied in two experiments. Seed lots with equal germinability under optimum moisture conditions gave large differences in emergence in a moisture stress situation. Within a rather wide seed size range, the size as such had only minor influence on the emergence rate.     

Improving chilling tolerance of rice seedling by seed priming with salicylic acid

This study was carried out in the Seed Research Laboratory of the Department of Crop Science, Ferdowsi University of Mashhad, Iran, in summer 2011. Rice (cv. Khazar) seeds were soaked in 0, 20, 50, and 100 mg l^?1 salicylic acid (SA) aerated solutions for 24 h and then dried back to original moisture content and were sown in three temperatures (28°C as normal and 12°C and 8°C as chilling temperature conditions). In the first step, both treated and untreated seeds were sown at the optimum temperature (28°C). Then, to apply chilling temperature, 15 days after sowing, one set of the seeds was exposed to 12°C and 8°C under controlled conditions. Results showed that all seedlings raised from seeds primed with SA solutions produced a higher root and shoot length, final emergence percentage, and relative water content and also lower mean emergence time and time to 50% emergence (E50) in comparison with untreated seeds. Antioxidant enzyme system efficiently responded to the stress conditions and the priming treatment. Also seedling raised from primed seeds showed higher antioxidant activity at each temperature compared with control.     

Seed nitrogen accelerates the rates of germination,emergence, and establishment of rice plants

We examined the effect of seed nitrogen content on the rates of germination, emergence, and establishment of rice plants. Several seed lots with various nitrogen contents were obtained from the parent plants grown under 3 planting densities and 4 rates of nitrogen application. There was a clear negative correlation between the seed nitrogen content and germination time (R =0.88), whereas the correlation between the seed dry weight and germination time was very low (R=0.23). The seed lot with a high nitrogen content absorbed water faster than the seed lot with a low nitrogen content, especially on the first day after soaking, and also showed a faster emergence, exsertion of the fourth leave, and a more uniform germination. Moreover, the increase of seed nitrogen content as well as the prolongation of soaking time resulted in a uniform emergence. Therefore, seed vigor is likely to be enhanced by the increase of seed nitrogen content, which may be achieved by an adequate application of a large amount of nitrogen to parent plants. Consequently, it may be possible to improve and stabilize the establishment of directly sown rice plants by the sowing of vigorous seeds with a high nitrogen content.     

Effects of seed priming on growth and antioxidant components of hairy vetch (Vicia villosa) seedlings under chilling stress

Hairy vetch (Vicia villosa) is an important cover crop and green manure in dryland cropping system of Mediterranean regions. A delay in the onset of rainfall during autumn can inhibit hairy vetch seed germination, which exposes its early growth stages to low-temperature stress. The present study was carried out in a completely randomized design with four replications to evaluate the effects of seed priming on germination of hairy vetch under chilling stress. The treatments were seed-priming type (unprimed, hydro-priming, halo-priming, and osmopriming) and temperature (3, 6, 9, 12, and 15?°C). The results indicated that a decrease in temperature produced a linear decline in the germination rate of seeds treated with halo-priming and osmopriming (p?<?.01). The seedling length, seedling dry weight, and vigor index decreased in plants experiencing chilling stress (quadratic; p?<?.01) for hydro-priming, halo-priming, and osmopriming. The maximum germination rate was achieved using hydro-priming. Osmopriming prevented a decrease in the rate of germination at 3?°C. A decrease in temperature increased the proline and the soluble protein contents in all the seed priming treatments, but, decreased catalase and guaiacol peroxidase activity (p?<?.01). In brief, halo-priming, and hydro-priming enhanced establishment and growth of hairy vetch under chilling stress primarily through improvements in the physiological parameters and germination rate. This finding can increase the potential for cultivation of the hairy vetch in late planting date.     

Effects of seed priming, aggregate size and soil matric potential on emergence of cotton (Gossypium hirsutum L.) and maize (Zea mays L.)

Poor crop establishment, due to poor land preparation methods and inadequate soil moisture, continues to be a major constraint to crop production for smallholder farmers in the semi-arid tropics. On-farm seed priming (soaking seed in water) has been offered as a solution to this problem, but the ways in which this technology interacts with soil conditions are not well understood. The interactions between seed priming and soil physical conditions on cotton (Gossypium hirsutum L.) and maize (Zea mays L.) emergence and seedling growth were determined in laboratory pot experiments. The treatments included seed treatment (primed and non-primed), initial soil matric potential (−10, −50, −100, −200 and −1500 kPa) and aggregate size (<1, 1–2, 2–4.75 and 4.75–16 mm). Non-sieved soil was used as a control. The soil used (a Chromic Cambisol) was collected from Save Valley Experiment Station in the southeastern lowveld of Zimbabwe. The pots of soil were allowed to dry out after planting, to simulate a deteriorating seedbed. Emergence was subsequently monitored, and plant growth measured 8 days after planting. Final percent emergence and seedling growth decreased with initial matric potential but increased with priming in both crops. Large aggregate sizes generally had an adverse effect on emergence and growth. The data are consistent with the hypothesis that on-farm seed priming can partly compensate for the negative effects of low soil matric potential and large aggregate sizes on crop establishment.     

Effects of light and temperature treatments on germination and physiological traits of stevia seedling (Stevia rebuadiana Bertoni)

Light and temperature are among the environmental factors affecting germination of seeds and seedling growth. Therefore, this experiment was carried out to evaluate the effect of light (light, dark, and combined light and dark) and temperature (15, 20, 25, and 30?°C) treatments on seed germination indices and physiological traits of stevia. With increasing temperature to 25?°C, percentage and rate of germination, seedling length, and vigor index increased. Also, dark and integrated treatments light and dark conditions caused increased all traits, except for the mean germination time. The highest proline and protein contents were achieved under light conditions at 15 and 30?°C, respectively. With increasing temperature, the activity of antioxidant enzymes catalase and superoxide dismutase increased. The highest activities of catalase and superoxide dismutase were observed under light condition. In contrary, the highest peroxidase activity was observed under dark condition. Overall, the results showed that dark and combined dark and light conditions at 25?°C improved the physiological characteristics of the plant that can increase germination indices.     

EFFECTS OF SOAKING TEMPERATURE,STRATIFICATION, POTASSIUM NITRATE AND GIBBERELLIC ACID ON SEED GERMINATION OF LOQUAT TREES

The present study was carried out to increase loquat seed germination with treatments consisting of two soaking temperatures (24 ± 2°C and 38 ± 2°C), chemical agents [control, 0.5% potassium nitrate (KNO₃) and 250 mgL^?1 gibberellic acid (GA₃) each for 20 h], and different moist chilling (MC) periods (1, 2, 3 and 4 weeks under 4–5°C). Compared with 24 ± 2°C, soaking at 38 ± 2°C reduced germination%, mean daily germination (MDG), and mean germination time (MGT), plumule and radicle lengths. Germination percentage, days to 50% emergence, fresh weight and lateral root numbers significantly reduced as MC period increased. KNO₃ and GA₃ had no significant effect on germination percentage, MDG, MGT and lateral root numbers. KNO₃ reduced days to 50% emergence and radicle length, but increased fresh weight compared with control and GA₃. Finally, our results suggest the soaking at 24 ± 2°C followed by 0.5% KNO₃ each for 20 h plus 1 week of MC or soaking at 24 ± 2°C followed by 250 mgL^?1 GA₃ each for 20 h plus 2 week of MC.     

Effect of aggregate size on water uptake by peanut seeds

In a lateritic sandy clay loam soil contained in a soil bin, three aggregate size ranges (0.25–0.50, 1.0–2.0 and 2.0–4.0 mm) were established by different tillage intensity to vary the seed—soil contact and to determine the best seedbed for peanut seedling emergence. The general objective was to study the water uptake and diffusivity of the seeds as well as the aeration, water transmission and thermal properties of the seedbed. In the seedbed with the finest aggregate size, the water uptake was maximum and the time needed for germination was least.     

Is Direct Seeding a Biologically Viable Strategy for Restoring Forest Ecosystems? Evidences from a Meta‐analysis

Ecological restoration has become an important technique for mitigating the human impacts on natural vegetation. Planting seedlings is the most common approach to regain lost forest cover. However, these activities require a large economic investment. Direct seeding is considered a cheaper and easier alternative technique, in which tree seeds are introduced directly on the site rather than transplanting seedlings from nurseries. To evaluate the effectiveness of direct seeding, we conducted a comprehensive search of the literature using ‘restoration’, ‘direct seeding’ and ‘sowing’ as keywords, and we performed a meta‐analysis using 30 papers and 89 species. We used two different measures of restoration success: seed germination probability and success probability (the chance that a seed germinates and survives until the end of the experiment). In general, restoration attempts using direct‐seeding techniques were relatively unsuccessful. On average, seed germination and success probability were 0·239 and 0·114, respectively, and were not affected by climate, species successional group or the application of pre‐germinative treatments. Germination and success probability increased with seed size, and the use of physical protections resulted in a nearly twofold increase in germination probability, but this effect faded by the end of the experiments. Because of the low rate of seedling success, we suggest the use of direct seeding as a complementary technique to reduce restoration costs, particularly for species with large seeds and known high germination rates, but our results do not support direct seeding as a substitute for seedling planting. Copyright © 2015 John Wiley & Sons, Ltd.     

Preservation of seed viability during 25 years of storage under standard genebank conditions

Maintaining sufficient viability is critical to the sustainability of ex situ conserved seed collections. For this reason, accessions are regenerated when viability falls below a predefined threshold. Viability is monitored by determining the germination ability of accessions at predefined time intervals. Optimizing the frequency of these germination tests, in order to avoid waste of resources, is hampered by the scarce availability of data about seed longevity, particularly for material maintained under genebank conditions. Here we report on the analysis of nearly 40,000 germination test results collected for a wide range of crop species over a 25-years period by the centre for genetic resources, the Netherlands (CGN), where seeds of genebank accessions are dried to 3–7 % moisture content and stored for the long term under near-vacuum in aluminium foil bags at ?20 °C. The results indicate that seed viability is well maintained for the large majority of seed lots during the first 25 years after regeneration as only 3.3 % of the monitoring tests revealed below-threshold germination values. It is argued that the majority of these sub-standard seed lots are due to other causes than seed ageing, including dormancy problems and estimation error in germination testing. For material, maintained under the seed management procedures and storage conditions practiced by CGN, it is therefore recommended to delay the first germination monitoring tests to 25 years after regeneration.     

沙埋和水分对3种灌草植物种子萌发及出苗的影响

选取柠条、紫花苜蓿和披碱草3种沙区常见灌草植物进行大田盆栽实验,研究种子在不同沙埋深度和供水条件下的萌发及出苗特性.结果表明：1）柠条和紫花苜蓿种子主要在2.5 ～5.0 mm供水量条件下出苗,柠条种子的最大出苗率为59.00％±7.21％,紫花苜蓿种子出苗率未超过40％,2.5 mm供水量条件下紫花苜蓿幼苗死亡率较大,存在萌发后大量死亡的现象,披碱草种子在5.0～9.0mm供水量条件下出苗较好,最大出苗率为52.67％士10.67％;2）柠条和紫花苜蓿种子的适宜沙埋深度分别为0.5～1 cm和0.5cm,随着埋深的增加,二者的出苗率显著降低,在4.5cm埋深时,柠条种子萌发后未出土幼苗数最多,披碱草种子对沙埋的适应性较好,4.5 am沙埋深度时出苗率最大.     

玉米亲本种子变幅振动式分级装置研制

针对玉米繁种阶段亲本种子播前分级效率低、筛面自净效果差的问题,该研究提出一种变幅振动筛分方法,并设计了种子分级振动筛装置,对驱动机构和自净清筛装置进行设计与分析。在喂入量2.5 kg/s的条件下,以京科968玉米种子为试验对象,以分级合格率、作业时间和卡种数量为试验指标,通过四因素（进料口高度、振幅、振动频率和筛面倾角）三水平Box-Behnken试验,建立各因素与试验指标间的回归模型,并对参数进行优化。结果表明,影响变幅振动式分级装置分级合格率的主次因素顺序为振动频率、筛面倾角、振幅和进料口高度,影响作业时间的主次因素顺序为振动频率、振幅、筛面倾角和进料口高度;卡种数量具有较大的随机性,当振幅和振动频率都较低时,筛面卡种数量急剧增多,自净效果极差。最优参数组合为进料口高度19 mm、振幅5 mm、振动频率8.25 Hz、筛面倾角7°,模型优化预测结果为分级合格率88.04%,作业时间40 s。在最优条件下的验证试验结果为分级合格率89.55%、作业时间39 s,平均卡种数量8粒,与预测结果基本一致,较等幅振动式分级装置的分级合格率提高3.25个百分点,作业时间减少4 s,平均卡种数量减少2粒,作业性能优于等幅振动式分级装置。分级装置分级效率达0.33 t/h,各项指标均满足相关设计要求。研究结果可为繁种阶段种子分级装备的设计提供参考。