Effect of P Application on Rice Cultivated in Waterlogged and Upland Conditions and Changes of P Components in Soil

ZHOU Chunlin1,YIN Jinlai1,HONG Lizhou1,SHEN Qirong2,WANG Kai1,DING Jinhai1,WANG Maowen(1Institute of Agricultural Sciences of the Coastal District of Jiangsu Province, Yancheng 224002,China; 2.College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095,China)

rice cultivated in waterlogged condition ;?rice cultivated in upland condition;?effect of P application;?P component in soil

Both field and pot experiments were done to study the effect of P application on rice cultivated under waterlogged and upland conditions and the changes of soil P components.The initial effects of P application on increasing plant height, tiller numbers, root volume, shoot and root dry matter weight of rice cultivated in upland (RCU) condition was higher than those of rice cultivated in waterlogged codition(RCW).To obtain the maxium yield of 7 350 kg/ hm2 for RCW and of 6 570 kg/ hm2 for RCU, 104 kg/hm2 and 158 kg/hm2 of P should be applied respectively.The P fertilizer applied to the soil was mainly transformed into ResinP, NaHCO3P and NaOHP, which were important and available P resources for both RCW and RCU.Three P components were exhausted to a greater extent in rhizosphere soil than in nonrhizosphere soil of the rice cultivated under waterlogged and upland conditions.