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Abstract:

In order to understand the impact of fertilization on rice growth and the senescence process, field experiments were conducted to investigate the effects of fertilizer application on the yield and senescence of root and leaf of late season rice. The results showed that, the amount of root xylem sap and chlorophyll content of the no fertilizer treatment and no nitrogen treatments were lower than the other treatments in the whole growth process and the senescence rate was faster than the other treatments in the later growth stages. Amount of xylem sap root and chlorophyll content of the NPK+OM treatment were the highest in all the treatments, the senescence rate was obviously slower than other treatments in the later growth stages. The rice yield of no fertilizer or partial fertilizer treatments was significant lower than the treatments of the combination of nitrogen, phosphorus and potassium. The NPK+OM treatment got the highest yield which was up to 7.55 t/hm2, it increased the yield by 35.51% in contrast to the CK. The decline rate of chlorophyll was significant positive correlation to the decline rates of xylem sap. The rice yield was significant negative correlation to the decline rates of chlorophyll and xylem sap. It indicated that, the combination of N, P and K, especially combination with organic fertilizer, could reduce the decline rates of hybrid rice, and could keep high yield of hybrid rice.