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试验指出春小麦一生吸收土壤氮占78％左右,吸收肥料氮占25％左右。产量与植物吸收土壤氮成正相关,而与吸收肥料氮无明显相关。从氮肥平衡来看,尿素、硫铵在黑土和白浆土中被作物吸收平均占48％,土壤残留18％,未回收(损失)33％。加沸石按肥料重1:10显著地提高土壤残氮量。残留的氮绝大部分在0—15厘米的土层里,下层很少,30厘米以下没有氮肥下渗损失。黑土比白浆土肥力高。黑土的AN值为450,平均产量为6400公斤/公顷,白浆土为260,平均产量为4900公斤/公顷。
Experiments show that spring wheat soil nitrogen absorption of about 78% of life, nitrogen fertilizer absorbed about 25%. The yield was positively correlated with plant nitrogen uptake and no significant correlation with nitrogen uptake. From the point of view of nitrogen balance, urea and ammonium sulfate are absorbed by crops in black soil and albic soil on average by 48%, soil residue is 18% and uncycled (loss) is 33%. Addition of zeolite fertilizer 1:10 by weight significantly increased soil residual nitrogen. Residues of nitrogen most of the 0-15 cm soil layer, the lower few, less than 30 cm without nitrogen infiltration loss. Black soil is more fertile than white soil. Black soil had an AN of 450, an average yield of 6400 kg / ha, albacore soil of 260 and an average yield of 4900 kg / ha.