钾对水稻叶面积和透光率效应的研究  

A Study on the Effects of Potassium on Leaf Area and Transmittance in Rice

作　　者：蒋德安[1] 薛建明[1] 陆庆[1] 饶立华[1] 李安华[1] 

机构地区：[1]浙江农业大学基础课部

出　　处：《江苏农业学报》1990年第S2期24-30,共7页Jiangsu Journal of Agricultural Sciences

基　　金：农业部七.五重点课题

摘　　要：用盆栽和大田试验,研究了钾对水稻叶面积,单叶和群体透光率的效应。结果表明,钾可显著增加水稻叶面积。用生长曲线y=K/(1+Ae^(-BD))对盆栽水稻的叶面积生长进行模拟,不施钾(K_v)施1.59g钾/盆(K_1),施3g钾/盆(K_2),从移栽到抽穗,叶面积与天数之间分别具有极显著的同归方程。施钾后,大田水稻群体中下部的透光率,不因叶面积的增加而降低,相反有更多的叶片处于良好的光照条件下,施钾可增加剑叶的透光率,并使其在绿光区的透光峰发生兰移。施钾也可提高大田水稻的净光合率和谷粒产量。Pot and field experiments were carried out to study the effects of potassium on leaf area and transmittance in rice plants. Two rice ( Oryza satva L. ) cultivars were respectively planted in pots with 15kg paddy soil containing available K 25ppm ,N 48. 8ppm ,P 15. 5ppm and in the field containing available K 83ppm,N 120ppm,P 54ppm in the soil.The results showed that in both the pot and field experiments the leaf area from maximum tilling stage to heading stage increased with application of potassium. K_0(no application of K),K_1(l. 5gK/pot)and K_2(3. 0gK/pot)all had an extremely significant(P=10^-6) regression equation between the leaf areas and days from transplanting till heading stage by imitating growth curve y = K/(l+Ae^(BD)) ,but constants K,A and B were smaller in the case of K_0. In the field experiment potassium did not depress transmittance in the population with increasing leaf area index. On the contrary,more leaves were in favorable conditions of more intensive illlumination because of the greater erectness of the leaves and higher transmittance of the flag leaves. Along with the increase of potassium application level,the peak of the leaf trans-mittant spectrogram drifted towards shorter wavelenth within the green light range. Net photosyn-thetic rate of the flag leaf and grain yield of rice also rose by applying potassium into the soil .

关 键 词：水稻 钾营养 叶面积生长曲线 群体透光率 叶片透射光谱 

分 类 号：S[农业科学]