施钾对提高小麦籽粒产量和蛋白质含量初步研究

施钾时期和施钾量的研究说明:(1)土壤有效钾含量低于80ppm,施钾可以有效地促进小麦的生长和发育,主要表现在植株增高、叶龄提前,初生根和次生根数增多;单株茎数、干重和叶面积系数增加,施钾时期越早效应越大;施钾量则有一定范围,越过一定范围效应降低。(2)施钾可以提高小麦籽粒产量,施钾时期与籽粒产量呈正相关;施钾量对籽粒产量影响较大,在一定范围内,随施钾量的增加产量呈增长趋势,超过一定范围则呈缩减趋势,施钾时期以底施效应最大,施钾量以每亩4.8Kg(K_(20))最为经济。(3)施钾可以改善小麦籽粒品质,主要是提高籽粒蛋白质含量,而且随施用时期后延,籽粒蛋白质含量呈递增趋势。扬花期施钾,对提高籽粒蛋白质含量效果显著。在底施和拔节期施的情况下,随施钾量的增加而递增,扬花期施钾量以每亩4.8Kg效果最好。

A STUDY FOR POTASH APPLICATION TO RAISE WHEAT GRAIN YIEAD AND TO IMPROVE ITS QUALITY

The results that is proved by the authors by means of the stage of K fertilizer applied and the amounts of K fertilizer applied are as follows: If there is less than 80ppm of the effective potash in the soil, applying K fertilizer can effectively promote the growth and the development of wheat, maily express that plant length is higher, leaf age gets ahead, primary root and secondary root are more, stems and dry weight per plant and leaf area index(LAI) increase. The earlier applying K ferlilizer is, the more its effection is. The effection of the amount of K fertilizer applied would be raised until surpassing a certain range. On the effection to the yield formation, It is the biggest as the bottom fertilizer and it is the most economical when the amount of applied is 4.8Kg K_2SO_4 per mu. Potash application can improve grain quality which mainly raise the content of protein. The content of protein in grain will gradually raise in corresponding with posting the time of K fertilizer applied. Potash applica -tion mainly raise the content of protein. The content of protein in grain will gradually raise in corresponding with posting the time of K fertilizer applied. Potash application at the anthesis stage can raise the content of protein markably. The content of grain protein express the tendency to increase with raising the amount of K fertilizer applied at the bottom and elongation stage. It is the most economical when appling 4.8Kg K_2SO_4 per mu at the anthesis stage.