Abstract:

Abstract: With super hybrid rice Jinyou527 and Qianyouliuhao as materials, source-sink characteristics were studied under different fertilizer-N application rate. The results showed that with the application rate of fertilizer-N improved, crop growth rate, biggest leaf area index, effective and highly effective leaf area index, leaf area rate, photosynthetic potential and total quantity of leaf source increased gradually, whereas ratio of effective and highly effective leaf area in total leaf area, net assimilate, single stem-sheath weight at booting stage were just opposite. Total amount of spikelets and total sink potential raised gradually with the increase of fertilizer-N application rate in the range of 0-315 kgN/ha, while 1000-full grain weight, spikelets/leaf area and filled spikelets/leaf area and grain weigh/leaf area decreased gradually. There is a significantly positive correlation relation between grain-leaf ratio and 1000-full grain weight or seed setting rate, and also total sink potential was positively correlated with total amount of spikelets at the significant level of P0.01.