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sowing time tests
相关语句
  播期试验
     Some Problems Evaluated from Fine Seed Strains,Soil Fertility and Sowing Time Tests in Wheat Production on Weibei Rainfed Highland
     从品种、肥力、播期试验看渭北旱原小麦生产中的一些问题
短句来源
  相似匹配句对
     Time
     时间(英文)
短句来源
     Time is...
     时间
短句来源
     2.suitable sowing time;
     二是适时播种;
短句来源
     The best sowing time is March to May;
     杜鹃花的播种时间以3—5月份为宜;
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     5.sowing;
     5、播种;
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The types and characteristics of growth stage variation of each varietyon sowing time test were studied in 1973-1982, at Changsha. The results wereanalysed useing statistical method of system cluster analysis and summarizedas follows. 1. The growth stage of 89 varieties tested may be classified into thirteentypes) four types belong to early varieties with the growth duration from 105to 125 days; seven types belong to medium varietis changing from 130 to 150days; and two types belong to late varieties...

The types and characteristics of growth stage variation of each varietyon sowing time test were studied in 1973-1982, at Changsha. The results wereanalysed useing statistical method of system cluster analysis and summarizedas follows. 1. The growth stage of 89 varieties tested may be classified into thirteentypes) four types belong to early varieties with the growth duration from 105to 125 days; seven types belong to medium varietis changing from 130 to 150days; and two types belong to late varieties varying from 150 to 170 days. 2. The tendency of growth stage (y) variation of each variety vary withthe difference of sowing time(x). Late varieties show linear modle (y = a+bx).The growth duration is shortened by 5-6 days with every 10 days delay insowing from late March to late July. Early and medium varieties show quadra-tic modle (y=a+b_1x+b_2x~2). The growth duration is shortened with the sowingtime advanceing from late March to mid-june, but prolonged with the sowingtime advanceing from mid-june on Hence, the growth stage of each variety sowedin different season, the optimum sowing time for early and medium varietiesand the latest sowing time for late varieties can be estimated. 3. The relative variation range of the growth duration of each variety ofdifference ecological type is continuous with different sowing season in thefollowing sequence : late varieties more than 60%, early varieties 40-60%, andmedium varieties less than 40% . The relative variation range can be applied forclassifying temperatural and photoperidic reaction types of varieties in naturalconditions.

本文提出了水稻品种生育期变化类型的划分方法,分析了长沙地区1973-1982年自然条件下分期播种各供试品种生育期聚类的结果,和不同熟期水稻品种齐穗日数依播期而变化的直线型和曲线型模型,以及品种生育期变化的趋势和稳定性。还讨论了系统聚类分析用于品种生育期分类的可行性等有关问题。

Sowing time tests of different type of wheat variety and investigation to Hebei, Shandong, Henan and Jiangsu province were done. Results indicated that in Huang Huai winter wheat area when minimum temperature in winter was not lower than-13.2℃ and accumulated temperature before winter reached 400℃ the frost damage did not happened, and planting weak winter type of wheat variety, as ccmpared with other winter type of wheat variety, usually output increaaedby 7.3—13.1%, with maximum bing 29.4%. The latesowing...

Sowing time tests of different type of wheat variety and investigation to Hebei, Shandong, Henan and Jiangsu province were done. Results indicated that in Huang Huai winter wheat area when minimum temperature in winter was not lower than-13.2℃ and accumulated temperature before winter reached 400℃ the frost damage did not happened, and planting weak winter type of wheat variety, as ccmpared with other winter type of wheat variety, usually output increaaedby 7.3—13.1%, with maximum bing 29.4%. The latesowing and late maturing problem solved by utilizing early-maturingvariety of winter wheat was also disscussed.

通过不同类型小麦的播期试验和对冀、鲁、豫、皖、苏调查表明:“黄淮冬麦区”的晚茬麦在冬季极端最低气温不低于-13.2℃,冬前0℃以上积温在400℃以下种植偏春性类型品种,一般比种植冬性类型品种增产7.6—13.1%,最高可增产29.4%。种植冬性早熟类型品种可提前3—5天成熟,为秋粮早播、丰产奠定了基础。

 
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