Differences in Accumulation and Translocation of the Nutrients and Dry Matter between Dry and Paddy Cultures of Rice Cultivar Jia Zao 935

The comparative experiments were conducted to study the difference between dry cultivation with mulching plastic film (DC) and conventional paddy cultivation (PC) in dry matter accumulation and translocation, and nutrient uptake and utilization of rice cultivar Jia Zao 935. The results showed that DC had the higher proportion in re translocation of assimilates stored in stem and leaf into panicles at grain filling stage, and apparent transformation rate of dry matter in stem and leaf, and harvest index, as compared with that of PC, but smaller dry matter accumulation after booting, particularly during the heading to maturing, finally leading to lower grain weight and yield. The relatively more N accumulation was found in DC before booting, but after that N as well as P and K accumulation was markedly smaller than that in PC. DC had the higher N, P and K accumulation percentage at the early growth stage, but lower at the middle and late growth stages. Moreover the plants in DC showed smaller mean accumulation rate of N, P and K in the whole growth period. The results also showed that the grain yield was significantly positively correlated with the dry matter and nutrient accumulation at heading and maturing stages.