Nutrient Balance in Relation to High Yield and Good Quality of Potato on an Acid Purple Soil in Chongqing, ChinaEnglish Full Text

HE TIANXIU, WU DEYI, HE CHENGHUI, HE FUJIAN, M. MARCHAND and R. HARDTER (Southwest Agricultural University, Chongqing 4100716 (China)) (Hokkaido University, Sapporo (Japan)) (International Agriculture Division, SCPA, Mulhouse, Cedex(France)) (Kail und Sal

Abstract: A field experiment was carried out to study nutrient balance among N, P, K and Mg in potato cultivation on an acid purple soil in Chongqing, China. The experiment included 8 treatments with equal P rate of 120 kg P2O5 hm-2: N0K2, N1K2, N2K2, N3K2, N2K0, N2K1, N2K1Mg and N2K3, where N0, N1, N2 and N3 stand for the N rates of 0, 75, 150 and 225 kg N hm-2, and K0, K1, K2 and K3 for the K rates of 0, 165, 330 and 495 kg K2O hm-2, respectively. Among the treatments designed, Thatment N2K2 with a nutrient supply ratio of N:P2O5:K2O:MgO = 1.25:1:2.75:0.28 gave the highest tuber yield and dry matter, highest starch and Zn and lowest NO3- contents in tuber, and high N, P and K use efficiency with an uptake ratio of N:P:K:Mg = 11.38:1:13.32:0.33 by tuber. Yield and starch and protein contents of tuber were the lowest in Treatment N0K2. Dry matter was the lowest but protein and NO3- contents were the highest in Treatment N2K0. Treatment N2K1Mg had the highest N, P and K utilization rates. Statistical analysis showed that yields of tuber and starch were in a positive linear correlation with the uptake amount of various nutrients and protein of the potato tuber was in a significantly positive linear correlation with tuber N cotent and in a significantly negative linear correlation with tuber K and Mg contents. Balanced application of N, P, K and Mg fertilizers （Treatmeat N2K2） was recommended for realization of high yield and good quality in potato cultivation.

Keywords：

acid purple soil; nutrient balance; potato;

Series：
(D) Agriculture; (A) Mathematics/ Physics/ Mechanics/ Astronomy
Subject：
Physical Geography and Topography; Fundamental Science of Agriculture; Agronomy
Classification Code：
S155.4

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Nutrient Balance in Relation to High Yield and Good Quality of Potato on an Acid Purple Soil in Chongqing, ChinaEnglish Full Text

HE TIANXIU, WU DEYI, HE CHENGHUI, HE FUJIAN, M. MARCHAND and R. HARDTER (Southwest Agricultural University, Chongqing 4100716 (China)) (Hokkaido University, Sapporo (Japan)) (International Agriculture Division, SCPA, Mulhouse, Cedex(France)) (Kail und Sal

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