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首页> 外文期刊>Агрохимия >Concerning the question of soil analysis in late autumn with regard to nitrogen top dressing of winter crops in early spring.
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Concerning the question of soil analysis in late autumn with regard to nitrogen top dressing of winter crops in early spring.

机译：关于深秋的土壤分析问题，涉及早春冬季作物的氮肥追肥。

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Field trials were carried out in Belarus between 1991 and 1993 with winter rye cultivated on a dernopodzolic sandy loam soil. P80:K120 (background), background + N30 (prior to sowing), or background + N60 (prior to sowing) were applied to experimental plots. Soil was analysed for available N, ammonium N and nitrate N from the plough (0-20 cm) and sub-plough (21-40 and 41-60 cm) layers at the following times: in the autumn after harvesting of the previous crop, but before application of fertilizers;in November, after application of fertilizers and after the autumn growth period of the crop; and in April, at the beginning of the spring growth period of the crop. Levels of mineral N in the upper 2 soil layers (0-40 cm) varied widely between Novemberand April, by ?5%. However, differences in levels of available N were minimal (4-7%). It is therefore recommended that soil analysis for subsequent top dressing of winter crops be carried out in November, as soon as air temperatures are consistently ?鳦 (average over a 24 h period).
机译：1991年至1993年在白俄罗斯进行了田间试验，将冬黑麦种植在德诺泊地沙质壤土上。将P80：K120（背景），背景+ N30（播种之前）或背景+ N60（播种之前）应用于实验区。在以下时间分析了耕作层（0-20厘米）和次耕层（21-40和41-60厘米）中土壤中的有效氮，铵态氮和硝酸盐氮：在收获前茬作物后的秋季;但在施用肥料之前;在11月，在施用肥料之后和作物的秋季生育期之后;在四月份，即春季作物生长期的开始。 11月至4月之间，上部2个土壤层（0-40厘米）中的矿质N水平差异很大，约为5％。但是，有效氮水平的差异很小（4-7％）。因此，建议在空气温度持续稳定（24小时内的平均值）后，于11月进行土壤分析，以进行冬季作物的后续追肥。

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