施氮对大豆生长发育的影响

两年采用四个品种、三个施氮水平对大豆生长发育的研究结果表明,氮对提高叶面积指数、光合势、叶绿素含量和生长率均有促进作用,而净同化率随施氮增加而下降。施氮对大豆光合速率无显著影响。随施氮增加叶面积指数提高的正效应可以抵消净同化率下降的负效应,从而最终获得一个较高的生长率。因此,高产栽培首先应考虑获得适当大的叶面积指数。

Effect Of Fertilizing Nitrogen On The Growth And Development of Soybean

The effects of different quantity of nitrogen application on the growth and development of four soybean ( Gliccine max (L. ) Merr, ) varieties were studied through field experiments in 1988 and 1989. The rsults showed that, LAI, LAD, the content of leaf chlorophyl and CGR were incresed and NAR was decreased with the increse of N application. The photosynthetic rate was not significantly affected by the N application. With the increase of the quantity of N application , the positive effects of LAI was sufficient to compensate the negative effects of NAR to abtain a higher CGR. Therefore, a higher yield of soybean demands an appropriate higher LAI.