夏大豆光合速率与叶龄及水肥条件的关系

1986～1988年在本所防雨网室内,用盆栽方法研究了夏大豆叶片的光合速率与叶龄及水、肥条件的关系。结果表明:在山东省气候条件和本试验土壤肥力水平下,夏大豆主茎叶片的叶龄于12日左右时,光合速率达到最大值。每株施复合化肥(N:P_2O_5:K_2O=15:15:15)19.5g左右,每株每次供水1.8kg左右时,主茎叶片平均光合速率达最大值。小于或大干这三个数值时,光合速率都将迅速减小。得出了表达夏大豆光合速率与叶龄和水、肥用量关系的曲线回归方程。

RELATIONSHIP BETWEEN PHOTOSYNTHETIC RATE OF SUMMER SOYBEAN AND LEAF AGE, AMONT OF WATER AND FERTILIZER SUPPLY

Relationship between photosynthetic rate summer soybean and leaf age, amount of water and condition of fertilizer supply was investigated in this study. The results demonstrated that under the weather condition of Shandong province and the initial level of fertilizer the soil used in this study, highest photosynthetic rate of summer soybean was achieved when leaves of summer soybean were 12 days old. The mean photosynthetic rate of stem leaves of summer aoybean reach maximum value when about 19. 5g of complex fertilizer(N :P2O5:K2O= 15 : 15 : 15)and about 1. 8kg of water were suppliled to each plant. However, photosynthetic rate of summer soybean would decrease gradually or quickly when leaves of summer soybean were younger or older than 12 days, or condition of water and fertilizer supply was different from the above mentiond condition. The equation of curve regression of the relationship between photosynthetic rate of summer soybean and leaf age, condition of water and fertilizer supply was obtained.