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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：关于早春冬季作物的氮气顶部敷料的土壤分析问题。

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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：现场试验于1991年至1993年间在白俄罗斯进行，冬季黑麦培养在Dernopodolic Sandy Loam土壤中。 P80：K120（背景），背景+ N30（在播种之前），或者将背景+ N60（在播种之前）应用于实验图。在下列时间从犁（0-20cm）和亚犁（21-40厘米和41-60cm）层中分析土壤，铵（0-20cm）和亚犁（21-40厘米和41-60cm）层：在收获之前的作物后秋季，但在施用肥料之前; 11月，在施用肥料后和秋季生长期后的作物;并于4月，在春季生长期的作物开始。矿产水平在11月25日在11月份之间广泛多种多样的矿物质（0-40厘米）。但是，可用水平的差异最小（4-7％）。因此，建议在11月在11月进行后续敷料的土壤分析，一旦空气温度一致？鳦（平均超过24小时）。

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