RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (12): 2137-.doi: 10.11870/cjlyzyyhj201712023

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INFLUENCE ON P USE EFFICIENCY BY APPLICATION OF ANNUAL P AS#br#  BASAL FERTILIZER IN MAIZE SEASON UNDER MAIZERICE ROTATION

YUAN Guoying1, HAN Yuling1, CHEN Wen1, FANG Xuedong1, #br# WANG Dan1, LI Ping1, ZHAN Ming1, ZHAO Ming2   


  1. (1.Key Laboratory of Crop Physiology, Ecology and Cultivation(the Middle Reaches of the Yangtze River) of Ministry of
    Agriculture, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China;
    2.Institute of Crop Sciences,Chinese Acadency of Agricultural Sciences,Beijing 100081,China)
  • Online:2017-12-20

Abstract: The “springmaize & laterice” rotation is a new planting type in southern China recently. The phosphorus(P) fertilizer allocation in the two season crops(maize and rice) is important for understanding how P fertilizer efficiencies affect on crops yields. An annual maizerice field experiment was conducted in Wuxue County, Hubei province between March and October 2015. According to the P fertilizer amount used in the two crops, seven treatments were applied in the experiment, which includes no P application in both crop seasons(P0), conventional P application in both crop seasons(P1), 1/3 P for late rice was forward applied as basal fertilizer in maize season(P2), 2/3 P for late rice was forward applied as basal fertilizer in maize season(P3), all P for late rice was forward applied as basal fertilizer in maize season(P4), all P for late rice was forwarded and the total annual P was decreased by 15%(P5) and all P for late rice was forwarded and the total annual P was decreased by 30%(P6), respectively. We analyzed the crop yields, phosphorus uptake and phosphorus use efficiency in different treatments. Compared with the conventional P application(P1), the P3 and P4 treatments significantly increased the rice yield and the allocation of rive dry matter, maize, and rice yields increased by 4.87% and 6.74% respectively. There was no significant difference in rice yields between P5 and P1, but the yield of late rice was significantly decreased when the annual total P application decreased by 30%(P6). The forward application in maize season of P fertilizer for the late rice season significantly promoted the uptake of P by maize and late rice, and significantly reduced the apparent surplus of soil P. The soil phosphatedependent rate of two crops decreased significantly under P2, P3, and P4 treatments, in comparison with P1 treatment, by 11.63%, 26.47%, and 22.08%, respectively. From the perspective of P use efficiency, the P fertilizer cumulative recovery efficiency, agronomic efficiency, partial factor productivity and fertilization contribution rate of P4 treatment were significantly higher than those of P1, which was increased by 102.46%, 194.83%, 6.73% and 176.16%. Compared with P1 treatment, the treatment of P5 had no significant effect on the annual P fertilizer contribution rate and agronomic efficiency but increased the P recovery efficiency and partial factor productivity by 32.56% and 58.05%. The study proved that P application in maize season had significant residual effects in late rice season, and it had higher P use efficiency than that the P application in the rice season. All P fertilizer for late rice could be moved to maize season, and even the total P application amount was reduced 15%.

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