糜子/绿豆间作模式下施氮量对绿豆叶片光合特性及产量的影响

探讨施氮量对间作条件下绿豆叶片光合特性、氮素特征及产量的影响,以期为西北旱区糜子//绿豆间作模式的合理施氮提供理论依据。试验于2018-2019年在陕西榆林采用裂区设计,主处理设糜子间作绿豆(PM)、绿豆单作(SM)2种种植模式,副处理设0(N0)、45(N1)、90(N2)和135 kg hm^-2(N3)4个氮肥水平。结果表明,施氮处理下间作绿豆叶片净光合速率(Pn)、蒸腾速率(T_r)比不施氮平均增加10.5%~24.5%、15.2%~29.5%,提高了叶片光合特性;PSII最大光化学效率(F_v/F_m)、PSII实际光化学效率(ΦPSII)平均增加2.9%~7.8%、11.7%~28.4%,PSII非光化学淬灭系数(non-photochemical quenching coefficient,NPQ)降低10.3%~17.4%,叶片叶绿素荧光参数得到改善,对弱光的截获和利用能力提高,叶片PSII反应中心活性增强。单株叶面积、单位干质量叶片氮含量(N_mass)和单位面积氮含量(N_area)均随施氮量增加表现为先升高后降低的趋势;Chl a、Chl b含量增加,光合氮利用效率(photosynthetic N-use efficiency,PNUE)则比不施氮有所降低;不同施氮量均显著增加间作绿豆干物质积累量和荚数,百粒重2年平均分别比不施氮增加1.1%~6.9%,产量增加9.3%~19.7%。2年试验间作各处理土地当量比(land equivalent ratio,LER)为1.63~2.07,表现为间作产量优势。由此可知,施氮可改善间作绿豆叶片光合物质生产能力,延缓衰老,有效调节了光合系统对遮阴的适应性反应,且间作叶片光合性能对氮肥的响应要大于单作。糜子/绿豆间作模式LER大于1,可作为西北旱作农业区推广种植模式,在90 kg hm^?2施氮量下间作绿豆叶片光合特性表现最好,产量最高,LER最大,是其适宜施氮水平。     

糜子绿豆带状种植下糜子的氮素积累、代谢及产量变化

禾豆间作是一种高效的生态种植模式,为明确糜子-绿豆合理间套作种植模式下糜子对养分高效利用的机制,于2017—2018年在榆林小杂粮综合试验示范站,以单作糜子(SP)为对照,设糜子(P)-绿豆(M)4种间作模式[2∶2(2P2M)、4∶2 (4P2M)、4∶4 (4P4M)、2∶4 (2P4M)],分析糜子开花期和成熟期不同器官干物质积累、氮素含量及植株氮积累量,以期探讨叶片和根系氮素代谢的变化规律,进一步挖掘不同间作模式对糜子产量及其构成因素的调控效应。结果表明,糜子-绿豆间作可显著增加糜子开花期根系、茎秆、叶片和鞘的氮素含量,使成熟期穗的氮含量比单作增加10.9%～15.9%;间作有利于促进糜子器官的生长发育,与单作相比,间作模式下糜子成熟期干物质积累量两年试验平均提高11.6%～32.1%,植株氮素积累量增加12.8%～36.9%,其中糜子叶片和茎秆的氮素转运量分别比单作增加51.7%～78.9%和24.1%～55.6%,叶片对于穗的氮素贡献率增加40.6%～66.9%。糜子-绿豆间作模式可显著调节糜子旗叶和根系的氮素代谢,硝酸还原酶活性、谷氨酰胺合酶活性、可溶性蛋白含量及游离氨基酸含量均有不同程度的增加,2P4M处理下达到最大值。植株生理代谢、氮素营养的合理调控显著改善了糜子产量及其构成因素,产量表现为2P4M4P4M2P2M4P2MSP。综上所述,糜子-绿豆间作模式可促进糜子生育后期的氮素积累、转运及氮素代谢,延缓了植株的衰老,提高糜子产量,表现出明显的间作优势。本试验条件下,2P4M是陕北地区糜子-绿豆最佳的间作配比。     

Dynamics of water and nitrogen stress along the grapevine cycle as affected by cover cropping

Cover cropping is developing in vineyards as it may induce numerous ecosystem services. However, soil cover also competes with grapevine for soil resources. This work aimed at evaluating both the period and intensity of the resulting water and nitrogen stress experienced by grapevine by comparing treatments with bare soil, permanent and non-permanent soil cover. The adopted stress indices were the Fraction of Transpirable Soil Water (FTSW) and the Nitrogen Nutrition Index (NNI).Cover cropping improved winter soil water refilling, but the grass transpiration during spring later led to similar water stress of grapevine among treatments. In dry years, summer water stress was not higher with non-permanent cover than with bare soil. The building of a critical nitrogen content curve for grapevine enabled to diagnose an early nitrogen stress, from budbreak to flowering, in cover cropped treatments. NNI dropped then in dry years, particularly in cover cropped treatments.The early growth limitation of grapevine observed in cover cropped treatments was the consequence of mild early nitrogen stress, which suggests that perennial nitrogen reserves were reduced because of an earlier competition with cover crop. After grapevine flowering, water appeared to be the most limiting factor for both grapevine growth and nitrogen availability.In water limited environment, nitrogen stress is highly dependant on water constraints. However, this work reveals the partial uncoupling of the dynamics of water and nitrogen stress during the grapevine cycle in water-limited cropping systems, which highlights the relevance of a co-ordinated management of water and nitrogen.     

Genotypic variability in plant water status of French bean under drought stress

Seven genotypes of French bean (Phaseolus vulgaris L.) were evaluated under semi-controlled conditions at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Bangladesh to analyze genotypic variability in leaf water status under water stress. The plants were grown under two moisture regimes, viz. 80% field capacity (FC) and 50% FC throughout the growing season. The genotypes showed significant variation in water relation traits. Genotypes BB24 and BB43 maintained higher relative water content (RWC), but lower turgid weight/dry weight ratio (TW/DW) and water uptake capacity (WUC). When drought susceptibility index (DSI) among the genotypes was considered, BB24 was found the most tolerant to drought and BB04 was the most susceptible one. A close positive relationship between leaf TW/DW and DSI under drought was recorded (R ² = 0.627). Leaf TW/DW was decreased considerably due to water stress by 10% in genotype BB24 followed by BB43 (13%), and both BARI bushbean-2 and BB04 (19%). Stomatal aperture and whole plant transpiration rate were found minimal in the BB24 and BB43 compared to that of BB04 and BARI bushbean-2. Considering these water relation traits, genotypes BB24 and BB43 may be considered as relatively tolerant to tissue dehydration. The study also revealed that the TW/DW, WUC, stomatal aperture, and whole plant transpiration rate was negatively and significantly associated with yield; however, the RWC was positively correlated with yield under water stress conditions.     

S3307对始花期和始粒期淹水绿豆光合作用及产量的影响

淹水胁迫是作物生长发育过程中遭受的主要非生物胁迫之一,探究提高绿豆耐淹性的机制对绿豆抗涝栽培具有重要意义。本文在2017—2018年以耐淹性不同的绿豆品种绿丰2号和绿丰5号为试验材料,采用盆栽方式探究了烯效唑(S3307)对淹水胁迫下绿豆叶片生理、光合作用及产量的影响。结果表明,在不同生育时期淹水胁迫下,绿豆叶片的叶绿素含量(SPAD)及光合特性参数均显著下降,丙二醛(MDA)含量显著增加,始花期(R1期)淹水胁迫下绿豆的减产率为24.70%～33.63%,始粒期(R5期)减产率为18.07%～28.87%。2个绿豆品种均表现为R1期受淹水胁迫危害程度大于R5期,绿丰2号耐淹性强于绿丰5号。喷施S3307后显著提高淹水胁迫下绿豆叶片的SPAD、净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs),并显著降低了MDA含量。绿豆在R1期淹水胁迫下的缓解率为28.91%～52.34%,R5期缓解率为13.77%～27.36%。表明叶面喷施S3307可有效提高淹水胁迫下绿豆叶片的生理功能及光合能力,进而降低减产幅度,但不同淹水时期和绿豆品种对S3307的调控响应存在差异。     

Evaluation of table grape genetic resources for sugar,organic acid,and amino acid composition of berries

Variations in the sugar, organic acid, and amino acid composition of table grape berries were determined in three successive years in 129 grape cultivars. Three regional groups were represented among these cultivars; European, North American, and Japanese. All cultivars are conserved at the Fukuoka Agricultural Research Center in Japan. Three representative ripe average-sized bunches were selected from one vine per cultivar. Ripeness was judged by visual observation of seed color change to dark brown, without senescence of berry tissue. Soluble solids content (SSC) was weakly correlated with other berry traits, but strongly correlated with total sugar content. Genotypic variance (σ _g ²) was significant for all berry traits, especially for α ratio (sugar composition) and γ ratio (amino acid composition). The yearly effect (σ _y ²) was significant for SSC, total sugar content, and total amino acid content but not for α ratio, titratable acidity, β ratio (organic acid composition) and γ ratio. Repeatabilities over the 3 years were very high for α ratio and γ ratio, while they were low for SSC, total sugar content, titratable acidity, β ratio, and amino acid content. Correlation coefficients between the values of each individual year and the 3-year mean were relatively high for the α ratio and γ ratio. We highlight the varietal differences in the α ratio and γ ratio because of the low environmental variation. Two types of grape were distinguished on the basis of sugar composition: hexose accumulators (α ratio ≥ 0.81) and sucrose accumulators (α ratio ≤ 0.80). The hexose- and sucrose-accumulating traits were related to genetic or regional differences. Cultivars were classified into five types on the basis of the γ ratio. Like the α ratio, variation in the γ ratio is closely related to cultivar parentage and regional differences. Vitis vinifera cultivars exhibited a skewed distribution with a γ ratio below 1.0 because they contain low levels of sweet amino acids. In contrast, the γ ratio frequently exceeded 1.5 in American hybrid cultivars because they contain high levels of sweet amino acids.     

Dry matter and nitrogen accumulation and residues of oil and protein crops

Oil and protein crops are of growing importance in cropping systems. This study was carried out to compare oil crops of linseed, rapeseed, sunflower and protein crops of faba bean and white lupin for grain production, residual plant dry matter and nitrogen. Two field experiments with either oil or protein crops were conducted in 1993 and 1994, respectively. Total dry matter production, grain yield, residues, N concentrations and mineral N in the soil were measured. Dry matter production and distribution as well as N uptake and residues varied greatly among species and between years. In 1993, oil crops gave up to 3 t ha⁻¹ grain and 16 t ha⁻¹ residues with sunflower, while in 1994 up to 5 and 11 t ha⁻¹, respectively, were recorded with winter rape. Protein crops showed an opposite reaction in years. Nitrogen uptake and residual N amounts were correlated with dry matter production. Plant residues of oil crops contained 20–140 kg N ha⁻¹; those of protein crops up to 80 kg N ha⁻¹. Despite the variation of residual plant N the variability of mineral N in the soil at harvest was hardly influenced by crops and amounted to only 20–50 kg NO⁻₃-N ha⁻¹.     

Effects of nitrogen and water stress on the rehydration,endogenous hormonal regulation and yield of maize

Water scarcity is known to be a strong limiting factor affecting maize grown and yield in cold semi-arid regions. Numerous studies have shown that rehydration improves maize growth. Our study aimed to explore the effects of rehydration treatments on maize growth and yield under water and nitrogen stress during different growth stages. We selected the drought-tolerant maize variety Nendan 19 (ND19) and subjected it to water stress during the V6 (sixth-leaf), R2 (filling) and R6 (maturity) growth stages and a rehydration treatment after each stress stage. Our results indicated that N1 (N100 kg N ha⁻¹) and N3 (N300 kg N ha⁻¹) treatments significantly increased the leaf moisture status relative to water content (RWC), bound water content (BWC), free water content (FWC) and water potential (WP)) at different growth stages. Similar trends were observed in the accumulation of plant leaf and root hormones (zeatin+zeatin riboside, indole-3-acetic acid, abscisic acid and gibberellic acid), photosynthetic pigments and chlorophyll fluorescence. However, under the same water stress conditions, they decreased as the N rate increased and reached a minimum value in the S3 (water stress for N3) treatments. In addition, with growth stage advancement and extension of the rehydration time, both showed a gradual upward trend. The results showed that to save water resources in the cold semi-arid region, rehydration treatments (R2S1 and R2S3) significantly increased the photosynthetic pigments and chlorophyll fluorescence parameters, leaf moisture status, biomass, 100-grain weight, hormone content, ear characteristics and grain yield of maize.     

Grain yield, and dry matter and nitrogen accumulation and remobilization in durum wheat as affected by variety and seeding rate

The influence of crop density on the remobilization of dry matter and nitrogen from vegetative plant parts to the developing grain, was investigated in the durum wheat (Triticum durum Desf.) varieties Creso, Simeto and Svevo cultivated in the field at three seeding rates, 200, 250 and 400 seeds m⁻². Variety × seeding rate interaction was unsignificant for all recorded characters. Grain yield declined in the order Svevo > Simeto > Creso. Yield differences mainly depended on the different number of kernels per unit land and, secondly, on mean kernel weight. Spike components differed among varieties: Svevo and Simeto showed more kernels per spikelet and Creso more spikelets per spike. Grain yield was highest with 400 seeds m⁻² primarily due to the higher number of spikes per unit area, and secondly, to the higher mean kernel weight. Post-heading dry matter accumulation was highest in Svevo and lowest in Creso, but varieties showed a reverse order for dry matter remobilization and contribution of dry matter remobilization to grain yield. The increase of seeding rate increased both the post-heading dry matter accumulation and the dry matter remobilization from vegetative plant parts to grain. Nitrogen uptake of the whole crop and N content of grain was higher in Simeto and Svevo than in Creso. The N concentration of grain did not vary among varieties, but Svevo showed a markedly lower N concentration and N content of culms at maturity, which may be consequence of the high N remobilization efficiency performed by this variety. The N uptake by the crop was highest with 400 seeds m⁻², but the N concentration of culms, leaves and even grain was slightly lower than with the lower seed rates. The post-heading N accumulation was by far higher in Simeto and Svevo than in Creso, whereas remobilization was highest in Svevo and lowest in Simeto. The percentage contribution of N remobilization to grain N was by far higher in Creso than in the other two varieties. Post-heading N accumulation and N remobilization were highest with the highest plant density, but the contribution of N remobilization to N grain content did not differ between seeding rates.     

Estimation of phenotypic variability in symbiotic nitrogen fixation ability of common bean under drought stress using 15N natural abundance in grain

Common bean (Phaseolus vulgaris L.) is the most important food legume, cultivated by small farmers and is usually exposed to unfavorable conditions with minimum use of inputs. Drought and low soil fertility, especially phosphorus and nitrogen (N) deficiencies, are major limitations to bean yield in smallholder systems. Beans can derive part of their required N from the atmosphere through symbiotic nitrogen fixation (SNF). Drought stress severely limits SNF ability of plants. The main objectives of this study were to: (i) test and validate the use of ¹⁵N natural abundance in grain to quantify phenotypic differences in SNF ability for its implementation in breeding programs of common bean with bush growth habit aiming to improve SNF, and (ii) quantify phenotypic differences in SNF under drought to identify superior genotypes that could serve as parents. Field studies were conducted at CIAT-Palmira, Colombia using a set of 36 bean genotypes belonging to the Middle American gene pool for evaluation in two seasons with two levels of water supply (irrigated and drought stress). We used ¹⁵N natural abundance method to compare SNF ability estimated from shoot tissue sampled at mid-pod filling growth stage vs. grain tissue sampled at harvest. Our results showed positive and significant correlation between nitrogen derived from the atmosphere (%Ndfa) estimated using shoot tissue at mid-pod filling and %Ndfa estimated using grain tissue at harvest. Both methods showed phenotypic variability in SNF ability under both drought and irrigated conditions and a significant reduction in SNF ability was observed under drought stress. We suggest that the method of estimating Ndfa using grain tissue (Ndfa-G) could be applied in bean breeding programs to improve SNF ability. Using this method of Ndfa-G, we identified four bean lines (RCB 593, SEA 15, NCB 226 and BFS 29) that combine greater SNF ability with greater grain yield under drought stress and these could serve as potential parents to further improve SNF ability of common bean.     

Erratum to: Biomass and nutrient accumulation by cover crops and upland rice grown in succession under no-tillage system as affected by nitrogen fertilizer rate

Journal of Crop Science and Biotechnology - Due to an unfortunate oversight the author’s name and affiliation have been given erroneously. It should be read:     

滴灌模式和水分调控对夏玉米干物质和氮素积累与分配及水分利用的影响

采用裂区试验设计探究了地下滴灌和地表滴灌(drip underground, DU; drip surface, DS)模式下土壤水分调控(分别为田间持水量的40%～50%、60%～70%和80%～90%,记为W40、W60和W80)对夏玉米干物质和氮素积累与分配及水分利用效率的影响。结果表明,DU处理的吐丝后氮素积累量及水分利用效率分别较DS显著提高了6.18%和4.85%～8.61%。夏玉米的干物质、氮素指标及产量对滴灌模式的响应依赖于土壤水分调控水平,在W40和W60处理条件下,DU处理显著增加夏玉米的净光合速率,提高了吐丝后干物质和氮素的积累量及向籽粒的转运,最终DU处理的干物质积累量、籽粒氮素积累量、产量及氮肥偏生产力分别提高了3.29%～19.94%、?1.10%～20.65%、3.29%～19.94%和3.31%～23.64%。而在W80处理条件下, DS处理的干物质积累量、吐丝后氮素积累量、产量及蒸散量比DU处理分别提高了6.80%～12.24%、5.93%、8.39%～14.91%和9.73%～14.57%。综上所述,在限水灌溉条件下,地下滴灌能够增加吐丝后干物质积累量、氮素积累量及其对籽粒氮素的贡献率,最终增加产量。在充分供水条件下,地表滴灌更有利于干物质及氮素的积累,但由于消耗过多的水分,因此水分利用效率未显著增加。     

Accumulation,partitioning, and bioavailability of micronutrients in summer maize as affected by phosphorus supply

Decreased micronutrient concentration in cereal grains caused by excessive application of phosphorus (P) fertilizer may contribute to reduce their nutritional quality. To help correct this problem in maize grain, a 3-year field experiment was conducted to determine how P application rate affects micronutrient partitioning in maize shoots and other plant organs and micronutrient bioavailability in grain. Phosphorus application significantly decreased shoot zinc (Zn) and copper (Cu) concentrations at all growth stages but had no effects on shoot iron (Fe) and manganese (Mn) concentrations. As the P application rate increased, shoot Zn and Cu contents decreased, and shoot Fe and Mn contents increased. The ratios of pre-anthesis to post-anthesis mineral contents were not affected by P application rate except Zn. P application increased the percentage of Zn that was allocated to grain and decreased the percentage that was allocated to other tissues, but had no effects on the allocation of other micronutrients among tissues. The bioavailability of Zn, Cu, Fe, and Mn in grain decreased as P application rate increased. Overall, taking account of grain yield and nutrients concentration, P fertilizer rates should range from 12.5 to 25.0 kg P ha⁻¹ under the local condition. It can be concluded that not only grain yields, but also nutritional quality, should be considered in assessing optimal P rates in maize.     

吉林省绿豆低产原因及其优质高产栽培技术

从生产条件和栽培技术上分析了吉林省绿豆的低产原因，并提出了优质高产栽培技术。     

邻羟基苯甲酸胁迫对不同杉木无性系叶片核酸和蛋白质合成的影响

以对邻羟基苯甲酸胁迫具有不同抗性2个杉木无性系（即忍耐型和敏感型）为对象,分析胁迫对叶片遗传物质合成的影响。结果表明：邻羟基苯甲酸胁迫对忍耐型的DNA合成多表现为抑制效应,RNA合成多表现为促进效应,而对敏感型的DNA合成多表现为促进效应,RNA合成表现为抑制效应;在胁迫初期时各胁迫浓度对敏感型的蛋白质含量的促进效应大于忍耐型,但在胁迫中后期,而对敏感型的促进效应呈下降趋势,而对忍耐型的促进效应随胁迫浓度加大而不断增大,蛋白质合成能力不断提高。表明不同抗性杉木无性系基因表达调控模式存在较大差别,随着胁迫强度增大,忍耐型RNA和蛋白质的合成量增加,使更多的蛋白质参与了对此种胁迫的响应,而使其有更好的抗逆性。     

How does water and salt stress affect the germination and initial growth of Brazilian soya bean cultivars?

The effects of water and salt stress on rate of germination and seedling growth were investigated under laboratory conditions in 46 soya bean genotypes from Central-West region of Brazil to verify how these stresses may limit crop establishment during the initial growth stage and also to identify the most tolerant genotypes to drought and salinity. Mild water and salt stresses were imposed by seed exposure to –0.20 MPa iso-osmotic solutions with polyethylene glycol—PEG 6000 (119.57 g/L) or NaCl (2.357 g/L) for 12 days at 25°C. The germination percentage, seedling length and seedling dry matter were measured, and then, salt or drought tolerance indexes were calculated. The “NS 5909 RG,” “NS 7000 IPRO,” “NS 7338IPRO,” “FPS Solimões RR,” “NS 5151 IPRO,” “SYN 13610 IPRO,” “LG 60177 IPRO,” “NS 6909 IPRO” and “BMX Desafio RR” were identified as the most drought-tolerant genotypes, whereas under salinity conditions, the genotypes “5D 615 RR,” “BMX Desafio RR,” “5D 6215 IPRO” and “BMX Ponta IPRO” were identified as tolerant. The “BMX Desafio RR” is the genotype most adapted to both stress conditions and, therefore, should be used under conditions of water shortage and excess salt in the soil at sowing time.     

连作秸秆还田下玉米氮素积累与氮肥替代效应研究

针对东北地区农作物秸秆资源丰富,然而焚烧弃置严重,养分利用率较低等问题,探讨常年玉米连作下还田秸秆的氮肥替代效应在松嫩平原玉米种植生产上的可行性。试验于2017—2019年在东北农业大学校内试验场进行,采用框栽、连作方式,采用再裂区试验设计,主处理为秸秆不还田(S0)和秸秆还田(S1),副处理为3个施尿素梯度0(N0)、175 (N1)、350 (N2) kg hm^–2,再副处理为一次性施肥(基追比1∶0)和2次均匀施肥(基追比1∶1)。结果表明,每公顷还12 t玉米秸秆可替代单质氮36.80 kg, 2017—2019年黑龙江省产生的玉米秸秆量平均为4650.05万吨,秸秆还田可替代单质氮14.27万吨。在2次均匀施氮肥处理下,秸秆氮肥替代量比一次性施氮肥处理高26.88%。秸秆还田与玉米氮肥利用率负相关,在当地农业常用施尿素量350 kg hm^–2 (纯氮161 kg hm^–2)下,玉米氮肥利用率3年平均S0较S1高6.09%,产量S1较S0高4.66%,且在秸秆还田、2次等量施氮肥处理玉米产量最高为268.22 g...     

节水减氮对土壤硝态氮分布和冬小麦水氮利用效率的影响

针对当前关中平原冬小麦生产中氮肥投入过量、灌溉水资源不足的问题,研究节水减氮栽培模式下冬小麦籽粒产量、水氮利用及硝态氮淋失情况,能为确定冬小麦节水减肥环保增效的生产模式提供理论依据。于2017—2019年在陕西杨凌开展冬小麦节水减氮田间栽培试验,采用二因素裂区设计,施氮量为主处理,灌水量为副处理,设施氮量处理N300 (300 kg hm^–2)、N225 (225 kg hm^–2)、N150 (150 kg hm^–2)、N75 (75 kg hm^–2)、N0 (不施氮)和灌水量处理W2 (1200 m³ hm^–2)、W1 (600 m³ hm^–2)、W0 (0),分析小麦产量、水氮利用效率及土壤硝态氮淋失情况。结果表明,2017—2018年和2018—2019年小麦季灌水处理较不灌水处理分别增产14.88%～15.01%和4.11～4.16倍,但处理间差异不显著,而越冬期灌水600 m³ h...     

Translocation efficiencies and allocation of nitrogen,phosphorous and potassium in rice as affected by silicon fertilizer under high daytime temperature

High temperature has become a bottleneck limiting rice production in many rice‐growing districts. Silicon is considered as a beneficial element for rice development, being involved in mitigating adversity stress. In order to ascertain how high temperature and silicon affect nitrogen (N), phosphorous (P) and potassium (K) translocation efficiencies and allocation in rice plants, a field experiment with split plot design was conducted in two consecutive years. Silicon fertilizer treatments, including applying silicon fertilizer and without applying silicon fertilizer, were regarded as main plots. Temperature treatments, including high daytime temperature (HDT) and normal temperature (NT), were assigned as subplots. The results indicated that, as compared to NT, HDT reduced the translocation efficiencies of N, P and K in leaves and stems plus sheaths except for the K translocation efficiency in stems plus sheaths. Moreover, HDT decreased grain yield and the allocation rates of N, P and K in panicles at maturity. Under HDT, the application of silicon fertilizer obviously enhanced the N translocation efficiency of leaves and stems plus sheaths, and the K translocation efficiency of leaves. The application of silicon fertilizer increased grain yield and the allocation rates of N and K in panicles at maturity under HDT. Correlation analysis showed that rice grain yield was positively significantly correlated with N, P and K translocation efficiencies of leaves and their allocation rates in panicles at maturity. Conversely, grain yield was negatively related to the N and P allocation rates in leaves and stems plus sheaths at maturity. These results imply that HDT generated adverse effect on the translocation efficiency of nutrition in rice plants, which might be another damage induced by high temperature to the formation of rice grain yield. Additionally, silicon fertilizer could play a key role in positively regulating the N and K translocation efficiencies and allocation rates in rice under HDT.