[Interactive effects of P deficiency and Al toxicity on soybean growth: a pot experiment with acid soil].
Taking seven soybean genotypes differing in P efficiency as test materials, a pot experiment with acid soil was conducted to study the interactive effects of P deficiency and Al toxicity on the growth of the genotypes under liming and P fertilization. The results showed that P deficiency and Al toxicity were the limiting factors for the soybean growth on acid soil, and the impact of Al toxicity was more severe. There existed interactive effects between P deficiency and Al toxicity. Comparing with liming or P fertilization alone, their combination could greatly promote soybean growth. The impact of P deficiency and Al toxicity on the P uptake by soybean was far greater than that on N and K uptake. A reasonable planting system for soybean would be helpful for the amelioration of acid soil. The combined application of 1.103 g Ca(OH)2 x kg(-1) soil and 2.018 g KH2PO4 x kg(-1) soil) could increase the acid soil pH by 38.4% and the available P content by 3223.8%, and decreased the soil exchangeable Al content by 96.3%. Planting P-efficient soybean genotypes rather than P in-efficient soybean genotypes had better effect in acid soil amelioration.
Chen
Na
N
Ministry of Agriculture Key Laboratory of Soil and Plant Nutrition in South China, South China Agricultural University, Guang-zhou 510642, China. 2005220003@stu.scau.edu.cn
Wang
Xiu-rong
XR
Yan
Xiao-long
XL
Liao
Hong
H
D000535:Aluminum / Q000633:toxicity*; D017753:Ecosystem; D005838:Genotype; D006863:Hydrogen-Ion Concentration; D010758:Phosphorus / Q000032:analysis / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D013025:Glycine max / Q000145:classification / Q000235:genetics / Q000254:growth & development*
D012987:Soil; D010758:Phosphorus; D000535:Aluminum