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rotation formation
相关语句
  相似匹配句对
     formation;
     评价的形成性问题;
短句来源
     THE ROTATION PERIOD OF PLANETS AND“THE FORMATION TIME”
     行星的自转周期和形成时间
短句来源
     Galactic Rotation and the Criterion for Black Hole Formation
     星系的转动与黑洞形成的判据
短句来源
     On the Formation of Law
     论法的生成
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     rotation of the earth
     地球自转
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The kinds of crops and amount of fertilizers were selected as factors to improve the soil fertility for new terrace fields, according to chemical and physical characteristics of soil at mountain areas in Qinghai Province. The ways to improving soil fertility of new terrace were obtained by yield analyses, increase and decrease of soil nutrients, evaluation of economic profits on different ways. The best ways to improve soil fertility for new terracewereas follows: rotation formation with rape seed and...

The kinds of crops and amount of fertilizers were selected as factors to improve the soil fertility for new terrace fields, according to chemical and physical characteristics of soil at mountain areas in Qinghai Province. The ways to improving soil fertility of new terrace were obtained by yield analyses, increase and decrease of soil nutrients, evaluation of economic profits on different ways. The best ways to improve soil fertility for new terracewereas follows: rotation formation with rape seed and sequential green manure in the first year and spring wheat in the second year, fertilizers with N 90 kg/hm 2~120 kg/hm 2 , P 2 O 5 75 kg/hm 2~90 kg/hm 2 high quality organic fertilizer 30 m 3~45 m 3 .

根据青海省山旱区新修梯田理化特性,选择作物种类和施肥水平为因素,采用裂区设计组分出9种培肥方式。通过产量分析、土壤养分亏盈状况和经济效益评价,筛选出适宜山旱地新修梯田的培肥途径,新修梯田应采用油菜复种绿肥——春小麦为轮作方式,施肥水平以纯氮90kg/hm2~120kg/hm2,纯P2O575kg/hm2~90kg/hm2,优质农家肥30m3/hm2~45m3/hm2。

 
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