三种特用玉米的氮素积累与利用率特点

Study on nitrogen accumulation and use efficiency on high-oil,high-lysine and high-starch maize

以高油、优质蛋白及高淀粉三种不同类型的玉米为材料 ,以施入 15 0kg/hm2 和 2 0 0kg/hm2纯氮为两个处理 ,研究了玉米在不同的施肥水平下植株地上各部位氮素积累及利用率 (包括N的利用率、吸收率、转运率 )的特点。结果表明 ,三种不同类型的玉米在不同的施肥水平下植株地上部以及茎、叶、籽粒等器官中的百分含氮量及净含量均呈现不同的特点 ;在特定的气候条件下 ,植株的全氮量从吐丝期到收获期有明显的下降 ,在氮素利用率方面也表现出明显不同。图 1,表 3,参 3。

The N accumulation and N use efficiency(NUE;defined as a)the ratio of the amount of N recovered in grain or stover dry matter to the amount of fertilizer to the soil;b)the ratio of the amount of N recovered in grain to the amout of above ground plant total Ncontent;and c)the ratio of the amount of Nrecovered in grain to the amount of fertilizer Napplied to the soil in this study)were studied with three kind of maize of high-oil,high-lysine and high-starch traits at two mitrogen levels(150,200 kg N ha -1 ).The results showed that,there exit variation in the N concentration (percentage content)and the net N content in different parts of the plant of the plant among three kind of maize;under the specific climatic condition,the above ground plant total N content are declined obviously from silking to harvest.And also the NUE of three kind of maize are different.