有机肥用量对玉米体内养分浓度及分配的影响

Effect of different manure application rates on nutrition content and distribution in maize

通过5年（2002~2006年）的田间定位试验, 研究了不同施肥量处理对玉米体内养分浓度、养分分配及每形成单位籽实产量收获养分量的影响。结果表明：施有机肥具有稳产高产作用, 随着有机肥施用量的增加, 玉米的稳产作用更为明显；玉米籽实的氮素和磷素浓度均随有机肥用量的增加而增加, 钾素浓度与有机肥用量未呈现出明显相关性, 玉米秸秆中的养分浓度大体上随有机肥用量的增加而增加；玉米收获产品中氮、磷含量在籽实和秸秆中的分配比与产量均呈现较好的相关性, 钾表现不明显；玉米生长愈好（施肥愈多）, 每形成单位经济产量消耗的氮、磷、钾就愈多, 说明玉米对氮、磷、钾的利用都存在一定程度奢侈吸收。

A consecutive 5-year （2002~2006） field trial in the lower reaches of Liaohe River was conducted. The study investigated the effect of manure application rates on nutrient content, distribution in plant and amount in each harvested unit grain of maize. The results show that manure is an important factor in stable and high maize yield. The content of N and P in grain and stalk increases with increasing rate of manure application. K content in stalk shows the same tendency, but in grain is unrelated to the amount of applied manure. The results also indicate that maize yield is directly correlated with the ratios of N and P content in grain to stalk, and not K. Increasing nutrient consumption to produce unit grains with increased manure application implies that N, P and K are lavishly absorbed by maize crops.