播期对地膜甜菜个体发育及产质量的影响

为探讨播期与地膜甜菜生长发育的关系,指导生产适期播种,开展播期对地膜甜菜个体发育及产质量的影响研究.试验结果表明,随播期延后地膜甜菜出苗时间缩短,4月1日至5月1日,每晚播10d地膜甜菜出苗所需时间平均缩短1.7d.叶片数、叶丛高度、块根最大直径、根体长度和单根重量等指标均随着播期的延后呈现下降趋势.含糖率随播期延后呈先增后减的变化趋势.每早播10d新甜14号决根产量和产糖量平均提高13.4％和14.0％;Beta218块根产量和产糖量平均提高20.6％和21.8％.因此,应通过适期早播提高甜菜产量和产糖量.     

鲜食糯玉米春季播种期试验研究

以广东目前推广的鲜食型糯玉米品种香白糯为试材进行春季播期试验,结果表明:随着播期的推迟,糯玉米的各生育阶段及全生育期缩短,产量显著下降;晚播的籽粒粗蛋白含量显著低于早播,而晚播的籽粒淀粉含量显著高于早播.3月下旬至4月上旬是广州地区适宜的春季播种期.     

紫豇豆“绵紫豇1号”播种期及密度试验

摘要：为研究紫豇豆品种绵紫豇1号的配套栽培技术,为其栽培及推广提供科学依据,进行了6个播种期及3个种植密度的双因子试验,分析不同播种期与密度对绵紫豇1号的生育期、植物学性状和产量的影响。结果表明：对绵紫豇1号豇豆产量的影响顺序依次为播种期＞播种期与密度互作＞密度;产量随播种期的推迟呈下降的趋势,随密度的增大呈先升后降趋势。综合得出,绵紫豇1号在四川地区的适宜播种期为3月25日前后,播种期不宜太迟,太迟会影响产量;在土壤中上等肥力水平下的适宜种植密度为667 m2栽8 100株。     

不同播种期对水培生菜产量和品质的影响

以生菜品种绿领和弘农为材料,研究了春季不同播种期对水培生菜生长发育、产量和品质的影响。结果表明,不同播种期下生菜的产量和品质有显著差异,早播和晚播均降低生菜的产量和品质,播期为3月17日时产量最高,绿领和弘农分别为271.19 g/株和243.67 g/株;此播期的2个生菜品种VC含量也最高,且硝酸盐含量相对较低,表明选择适宜的播种期有助于提高生菜的产量和品质。     

"K新绿"鲜食大豆夏种播期比较试验

为了研究K新绿鲜食大豆在铜陵地区夏种最迟播种时期，选择6月25日、7月5日、7月15日、7月26日4个播期进行比较试验，结果表明：K新绿鲜食大豆在铜陵地区夏种最晚播种时间在7月上旬，7月5日播种的大豆生育期和植株生长均正常，结荚鼓粒较好，多粒荚率为82.6%，百粒鲜质量最大，为78.6 g，667 m2产量较高，为680.3 kg。建议夏种K新绿鲜食大豆最晚在7月上旬播种，以保证较高产量和收益。     

我国甜菜栽培模式研究进展

综述了我国甜菜栽培模式的发展现状,从不同栽培方式、播期、合理密植、合理施肥、合理灌水等方面阐述了对甜菜产量、质量的影响。     

特早熟松花菜浙农松花50天不同播期与密度配合试验

为确定特早熟松花菜新品种浙农松花50天在杭州地区的最佳播期和播种密度,设置6个不同播种期(6月24日、7月1日、7月5日、7月10日、7月15日、7月20日)和3个不同种植密度(30000、33000、36000株/h m2)复因子试验,比较分析不同播期与密度对植株性状、花球性状、产量及效益的影响.结果表明:浙农松花5...     

播期及整枝方式对设施厚皮甜瓜生长发育和产量的影响

以甜瓜品种"一品天下208"为试材,春季在杨凌镇关村塑料大棚内进行了3个播期及3个不同整枝方式试验,旨在探讨不同播期及不同的整枝方式对甜瓜生育进程及产量的影响。结果表明:春季厚皮甜瓜不同播期的生长发育和产量都存在显著差异,与其它播期相比,以2月16日进行播种的处理各生长发育时期提前,以2月21日播种的小区产量100.3kg最高,且果实发育正常,商品性好。不同的整枝方式处理中,以双蔓整枝生长发育期提前,甜瓜单果重大,质优。     

Spacing Experiments on Vegetables: II. The Effect of the Thinning Distance on the Yields of Globe Beet,Long Beet,Carrots and Parsnips Grown at a Standard Inter-Row Distance in Cheshire, 1948

Crosses were made in all possible combinations, between winter cauliflower varieties Tinribs and Cambridge Dwarf April, summer cauliflower variety Cambridge 5 and autumn cauliflower variety Majestic. When sown at their normal times these types mature in December, March, June, and September respectively. Data on the maturity periods for parents and Fi and F2 progenies were obtained in the form of accumulated day-degrees.

When all parents and progenies were sown at a date near to the normal sowing date for autumn and winter cauliflowers, the F, and F2 generations showed a continuous range in maturity periods between those of the parents and, although the F2 range was generally greater than that of its corresponding Fi, it did not exceed the parental extremes. When the sowing date was near that for summer cauliflowers, the Fi and F2 progenies of crosses which had Cambridge 5 as one parent matured almost as early as Cambridge 5, and the range of maturity was greatly restricted.

The annual habit of the summer and autumn types was considered to be partially dominant to the biennial habit of the winter types, and time of maturity was considered to be under polygenic control.

Possible improvement of the autumn cauliflower type by making crosses between summer and winter cauliflowers is discussed.     

播期对荆门地区甘蓝新品种中甘101生长发育及产量的影响

为研究不同播期对中熟秋甘蓝新品种中甘101在荆门地区收获期及产量的影响,设置5个播种期进行对比试验。结果表明:8月6日和8月13日播种的甘蓝产量最高,但生育期较长;7月16日播种的甘蓝生育期最短,但产量最低;7月23日和7月30日播种的结球甘蓝农艺性状大致相同,能够在相对较短的生育期下获得比较稳定的产量,因此认为7月23日—8月5日为秋甘蓝中甘101在荆门地区的适宜播期。     

Analysis of the Growth and Yield of Overwintered Onions

The growth of a number of onion cultivars sown on different dates during late summer in several years was assessed by regular sampling. The growth during the winter of five different winter-hardy cultivars was very similar, whereas that of Rijnsburger Bola, a cultivar normally sown in spring, was clearly slower. Sowing date was shown to affect final yield through its effect on overwintering size, which in turn influenced bulb size at harvest, the proportion of plants which bolted and the extent of winter losses. During the winter months the rate of leaf initiation appeared to be decreased to a lesser extent than the growth in dry weight, which itself was decreased less than growth in leaf area. The growth of the winter-hardy cultivars from all sowing dates and seasons was well summarized by a single linear relationship between the logarithm of plant dry weight and the accumulated day-degrees between 6° and 20°C from the day of seedling emergence. Using this relationship together with temperature records from past years it was possible to estimate the best average sowing date and the year-to-year variation in optimum sowing date. This approach may prove useful in predicting optimum sowing dates for other localities from past weather records.     

Rubus Stunt: A Virus Disease

In 1958, at three sites in the Vale of Evesham, a progressive increase in the yield of spring cabbage was obtained from increasing rates of application of nitrogenous fertilizers up to 279 lb. N per acre, as Nitrochalk. At a fourth, with later application of fertilizers and a relatively early cutting date, 6 cwt. per acre gave a yield response rather greater than at the other three sites, but higher rates of application of Nitrochalk produced no further increases in yield.

No yield advantage was gained by applying the fertilizer dressing in three doses during the growth of the crop rather than in one dose in the very early spring.

The uptake of potassium, phosphorus, magnesium and calcium by the plants increased as the rate of nitrogenous fertilizer increased. The need to maintain an adequate level of available potassium in the soil when using heavy dressings of nitrogenous fertilizers is emphasized.

The effect of a ploughed-in ley on the recovery of added nitrogen is discussed.     

夏芋丰产栽培技术研究

研究了３种种植密度、２种播种时期和２种地膜覆盖方式对早熟芋生产发育和夏收产量的影响。地膜覆盖与否是影响芋生长和丰产的关键因素，地膜覆盖比露比栽培增产９０．０９％，栽植密度是影响夏收单产的重要因素；播时期对生长发育和产量无影响。从综合因素考虑，要使夏芋丰产，应适时播种，及早覆盖地膜，密度为２３００株／６６７ｍ＾２。     

不同播期对大白菜秋早50生长发育及产量的影响

为确定大白菜新品种秋早50秋延后栽培安全播期,在陕西关中地区研究了不同播种期对秋早50生长发育和产量的影响。试验结果表明,在8月25日至9月12日播种,随着播期的推迟,秋早50的生育期延长,叶球宽、球叶数、叶球紧实度和产量指标均下降,9月7日以后播种的下降最为明显,因此,综合考虑产量和采收期,秋早50秋季最晚播期为9月4日。     

长沙地区早春苦瓜播期及栽培模式比较试验

以兴蔬春华苦瓜为材料,在长沙地区分别进行4种不同播期、栽培模式的比较试验,探讨不同播期及栽培模式对长沙地区早春苦瓜产量及经济效益的影响.试验结果表明,在长沙地区,2月底播种,采用地膜覆盖加小拱棚的栽培模式(即A2B2模式),能获得最大的经济效益,是早春苦瓜高产、高效、无公害栽培的最佳方式.     

The effects of sub-seed placement of liquid N and P fertilizer on the growth and development of bulb onions over a range of plant densities using primed and nonprimed seed

Phosphates-of-ammonium “starter” fertilizer solution was injected below onion seeds at sowing on a fertile sandy loam soil given basal N, P and K applications. Bulb crops were grown from primed and non-primed seed drilled at six sowing rates to give a threefold range of plant density. Irrigation and nitrogen application were monitored to ensure that plants remained unstressed throughout growth. The starter fertilizer resulted in increased P and N and reduced K content during seedling growth. In both an early-sown and a late-sown experiment, shoot growth was accelerated by starter fertilizer and shoots became approximately 50% heavier than those without starter. Growth curves showed that this was equivalent to a 3-3.5 d advancement of growth. Starter fertilizers resulted in 1-2.5 d advancement of crop maturity as shown by the date of 50% foliage fall-down. In the later sown experiment, starter fertilizer reduced the percentage of non-maturing ‘thick-necked’ bulbs. Bulb yields were not significantly increased by starter fertiliser. Data showing similar enhancements of seedling growth on other soils are also discussed. Seed priming advanced the date of seedling emergence but had no significant effects subsequently. Increases in plant density advanced the date of crop maturity and increased total bulb yields.     

不同播期对黄秋葵长势、抗病性和产量的影响

为在河北省推广种植黄秋葵,在安国、保定、邯郸、衡水和石家庄5个试验点进行黄秋葵分期播种试验,研究了不同播期对石秋葵1号、红玉和五福3个品种生长势、抗病性和产量的影响。结果表明:播期对石秋葵1号、红玉和五福生长势、抗病性和产量具有较大的影响,随着播期的推迟,3个品种的茎粗大致呈逐渐增高的趋势,株高呈先降后升的趋势(除2018年的红玉外),单株结果数则先增加后减少,单果质量(除五福外)逐渐增大;以4月20日、25日和30日为播期,得到的黄秋葵单株产量和折合667 m~2产量较高。综合得出,河北省黄秋葵种植以4月20日、25日、30日为播期最为适宜。     

冀西北坝上地区不同播期对卷丹百合农艺性状的影响

为了找出冀西北坝上地区栽种卷丹百合的最佳播期,进行了不同播期对百合生育期和农艺性状影响的研究,结果表明,在冀西北坝上地区栽种卷丹百合,随着播期的推迟,百合的株高和地径逐渐缩短。百合开花后鳞茎数已基本不再增加,而鳞茎周径和鲜质量迅速增长。因此要获高产、优质的卷丹百合,其播期最迟为5月11日,在温度稳定通过5℃以后,越早越好。     

不同播期对小型无籽西瓜产量及品质的影响

对春季小型无籽西瓜不同播期下的生育期、产量、产量构成及果实品质进行研究,结果表明,2月15日为春季小型无籽西瓜的最适播期。在此播期下,小型无籽西瓜产量最高、平均单株坐果数最多。本试验中,不同播期对果实的品质及采收时间影响不大。     

不同栽培方式对田家紫皮大蒜产量的影响

为提高内江地理标志产品田家紫皮大蒜产量,改善土壤结构,开展了不同播种方式、化肥减量和增施有机肥、大蒜分级消毒处理等多种栽培试验,以研究不同栽培方式对大蒜产量的影响.结果表明:采用浅宽沟撒播和条播的方式有助于增产,其中以浅宽沟撒播并覆盖稻草效果最好,大蒜667 m2增产达到35.4％;在传统穴播方式下,减施化肥和增施有机...