Effects of different fertilization on nitrogen accumulation characteristics of spring maize | 不同施肥处理对春玉米氮素累积特性的影响

Chinese. 采用田间小区试验研究了不同氮、磷、钾肥用量对春玉米氮素的累积特性的影响。结果表明:不同氮磷钾肥用量下春玉米氮素累积规律符合指数方程Y=ae-b/t。在N、P2O5、K2O用量分别为240,225,240kg•hm-2条件下(N2、P2、K2处理),春玉米的产量达到13725.5kg•hm-2,氮素累积总量达到3.504g•plant-1,均极显著高于其他各处理;氮素最大吸收速率最大,达到54.0mg•d-1.plant-1,且其出现时间较早;各处理中,以N2、P2、K2处理的氮素转运量最大,为1.477g•plant-1,而且转运的氮素营养占籽粒养分的比例最高,为73.04%。因此适宜的肥料用量不仅能有效地促进氮素的吸收、累积,而且能够提高氮素在籽粒中的分配比例,从而有利于高产的形成。

English. A field trial was conducted to study nitrogen accumulation characteristics of spring maize under deferent N,P and K application rates.The results indicated that N accumulation pattern could be described by exponential equation.Under N,P2O5 and K2O application rates were 240,225 and 240kg•hm-2(treatments N2,P2,K2),the yield was 13725.5 kg•hm-2.N accumulation amount of spring maize was 3.504g.plant-1,the highest among all the treatments.The highest N nutrient absorption rate(HNAR) of N2 was 54.0 mg•day-1.plant-1,higher than the other treatments,and the time of HNAR in maize was earlier than the others.The transferred amounts of N was 1.477 g•plant-1 under the treatments of N2,P2 and K2,and the ratio in grains was 73.04%,the highest among all the treatments.Fitting N,P2O5 and K2O application rate not only stimulated the absorption and accumulation of N nutrient effectively,but also increased the ratio of N nutrient in grains,therefore the high yield of spring maize could be achieved.