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1.各不同层次叶片都具有其独特的生理机能,并且是穗不同发育阶段之物质来源。叶片内物质消长的动态与产量结构变化有直接关系。2.不同时期功能最强之叶片(上数1—2展开叶)的全氮百分含量和绝对含量与产量和产量结构之间呈正相关。3.叶片对于环境氮素营养的变化很敏感。即随土壤氮素含量提高,各叶片干重,全氮绝对量也相应提高,最终产量和产量构成因素也相应提高。4.根据两年盆栽和田间试验,初步认为,分蘖期功能叶内含氮量只有达到5—6%范围时,才能为小麦植株丰产奠定物质基础。5.根据以上结果,我们认为,利用早期叶片诊断方法预测植株营养是有研究前途的。为此今后需要进一步明确不同品种春小麦不同时期功能叶片的位置,以及与产量有关的这些叶片的“临界营养水平”究竟是怎样的。
1. Different levels of leaves have their unique physiological function, and is the source of material at different stages of development of the spike. The dynamics of the growth and decline of matter in leaves is directly related to the changes in yield structure. The percentages and absolute contents of total nitrogen in leaves with the strongest function in different stages (upper leaves 1-2) were positively correlated with the yield and yield structure. 3. The leaves are sensitive to the changes of environmental nitrogen nutrition. With the soil nitrogen content increased, the dry weight of each leaf, the absolute amount of total nitrogen also increased accordingly, the final yield and yield components also increased accordingly. According to the two-year pot experiment and field experiment, it is preliminarily believed that only when the nitrogen content in the functional leaves at the tillering stage reaches 5-6% can the material basis be established for the high yield of wheat plants. 5. Based on the above results, we think that it is promising to predict plant nutrition by using early leaf diagnosis method. Therefore, in the future, it is necessary to further clarify the location of functional leaves of different varieties of spring wheat at different stages and what is the “critical nutrient level” of these leaves related to the yield.