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以二棱皮大麦(Hordeum distichum L.)品种76-22和六棱裸大麦(H.haxastihum L.)品种矮杆齐为材料,并用四种不同氮肥水平为手段,研究了春大麦籽粒的氮素积累规律和含氮量变化规律,主要结果是单株籽粒氮素积累过程可用Logistic 方程模拟,进一步测验表明:同一品种的各处理间,籽粒氮素的相对积累迅速一致,而矮杆齐快于76-22。籽粒含氮量在籽粒发育初期较高,其后逐渐下降,至乳熟中、末期最低,随后又逐渐上升;如增施追肥量,籽粒含氮量也增加。硝酸还原酶活性的测定表明,76-22后期的吸肥能力明显低于矮杆齐,表明76-22籽粒氮素的来源主要依赖于抽穗前吸收同化氮素的再分配,而矮杆齐则较多地依赖于抽穗后的继续吸收同化。
Four varieties of Hordeum distichum L. 76-22 and H. haxastihum L. were used as materials to study the effects of nitrogen fertilization on nitrogen The main result is that the process of nitrogen accumulation in a single plant can be simulated by Logistic equation. Further tests show that the relative accumulation of grain nitrogen in the same variety rapidly and consistently, At 76-22. The grain nitrogen content was high at the early stage of kernel development, and then decreased gradually, and reached the lowest level at the end of the milk ripening stage, then gradually increased. For example, the amount of topdressing fertilizer increased, and the grain nitrogen content also increased. The determination of nitrate reductase activity showed that the absorption capacity of 76-22 in the late stage was significantly lower than that of the dwarf rod, indicating that the source of 76-22 grain nitrogen mainly relied on the redistribution of the assimilation nitrogen before heading, More dependent on the continued absorption and assimilation after heading.