Increase effect of phosphorus absorption of potato population
and utilization effeciency by multiple application of phosphate
fertilizer with drip irrigation

【Objectives】 In recent years, potato yield have being increased to over 45000 kg/hm2 in the northern Yinshan Mountain of Inner Mongolia. However, phosphorus nutrition characteristics of high yield potato population are seldom studied, the phosphorus use efficiency is R in a low level. The optimize phosphorus management is in urgent need for high-yield potato production, and improves phosphorus use efficiency.【Methods】A field experiment were conducted with Kexin 1 as materials. The farmer cultivation mode and high-yield mode were compared for two years, and the phosphorus absorption, allocation and utilization of potato population with high yield under the drip irrigation condition were studied.【Results】Compared with the farmer mode, the commercial rate and tuber numbers per plant of the high-yield mode are significantly increased by 2.3% and 9.3%. The daily phosphorus accumulation amounts of the high-yield mode population is 0.67-0.78 kg/hm2 from the tuber initiation stage to the tuber bulking stage, which is 37% higher than the farmer mode. The phosphorus accumulation amount is 44.3-55.3 kg/hm2 for the high-yield mode during the whole growth period, which is about 10.0-12.1 kg/hm2 higher than the farmer mode, and the translocation rate of phosphorus for the high-yield mode is 85%-87% higher than the farmer mode. The P2O5 requirement to producing 1000 kg potato tuber under the high-yield mode is 1.95-2.10 kg, and the phosphorus use efficiency of potato is 21.6%-23.6%. 【Conclusions】With less input amount, phosphate fertilizer is divided into 6 parts, and applied with drip irrigation in the high-yield potato management. The results proved the sustanable P supply ability to potato, especallyfrom the tuber initiation stage to the tuber bulking stage, the accumulated phosphorus is at a rapid rate to ensuring high absorption efficiency and phosphorus use efficiency under the reduction of phosphorus fertilizer.