Content of different fractions of soil inorganic phosphorus and their contributions to phosphorus accumulation in winter wheat with different previous crops and at different fertilizer levels
In order to confirm the influence of different fractions of soil inorganic phosphorus and the effect on phosphor-us accumulation of winter wheat after different preceding crops,a two-factor field experiment was conducted to determine the total phosphorus,the available phosphorus and different forms of inorganic phosphorus contents in the topsoil(0-15 cm)before sowing and after harvesting,with three previous crops(maize,soybeans,and peanuts)at two fertilizer levels(P2O5 150 kg/hm2 phosphate fertilizer(+F)and P2O5 0 kg/hm2 phosphate fertilizer(-F)).Meanwhile,the phosphorus accumulation of win-ter wheat plants in mature period was measured,and the contribution of different fractions of inorganic phosphorus in soil to the accumulation of phosphorus of winter wheat plants was analyzed through path analysis.The results showed that the content of total phosphorus,available phosphorus and the different fractions of inorganic phosphorus in soil were significantly reduced in 0 kg/hm2 phosphate fertilizer treatment than that in 150 kg/hm2 phosphate fertilizer treatment.On one hand,at the conven-tional phosphate fertilizer level,the AP content in the preceding maize treatment was highest and significantly higher than oth-ers,being 18.61 mg/kg,and the content of the Pi,Fe-P and Ca10-P in soil in the preceding maize treatment were all the highest one in the three previous crops treatments,being 592.55 mg/kg,41.97 mg/kg and 338.77 mg/kg,respectively.The content of the TP was highest and significantly higher than others,being 972.80 mg/kg,and the content of the Al-P and O-P in soil in the preceding soybean treatment were the highest in the three previous crops treatments,being 43.44 mg/kg and 64.37 mg/kg,severally.The content of Ca2-P and Ca8-P in soil in the preceding previous peanut treatment were the highest one in the three previous crops treatments,being 27.53 mg/kg and 94.14 mg/kg,but there was no significant difference in the treatment com-pared with the previous maize and soybean crops.On the other hand,In 0 kg/hm2 phosphate fertilizer,the content of the TP,AP and O-P in soil in the preceding maize treatment were the highest one in the three previous crops treatments and significant-ly higher than others,being 770.47 mg/kg,13.50 mg/kg and 58.99 mg/kg,respectively.The content of Pi,Al-P,Fe-P and Ca10-P in soil in the preceding soybean treatment were 541.96 mg/kg,34.50 mg/kg,36.42 mg/kg and 320.62 mg/kg,and the Ca10-P content was significantly higher than other crops treatments,respectively.The content of Ca2-P and Ca8-P in soil in the preceding peanut treatment were the highest one in the three previous crops treatments,being 23.04 mg/kg and 78.78 mg/kg,respectively.And the phosphorus accumulation of winter wheat plants in the preceding peanut treatment was all the highest one at the two phosphate fertilizer levels,which was 33.11 kg/hm2 and 25.14 kg/hm2.At the conventional fertilization level,there was no significant difference between the peanut previous treatment and previous treatments of maize and soybean,but under the 0 kg/hm2 phosphorus fertilizer level,that peanut previous treatment was significantly higher than the previous treatments of maize and soybean.In addition,the order to direct contribution(showed as the path coefficients)of different fractions of soil inorganic phosphorous on the accumulation of phosphorus of winter wheat plants form the highest to the lowest was as Ca2-P,Al-P,Fe-P,Ca8-P,O-P,Ca10-P.And Ca2-P in soil was the direct source to phosphorus accumulation of wheat plants,Al-P came second,and Fe-P and Ca8-P in soil were the slow-released phosphorus sources to wheat plants,while O-P and Ca10-P in soil were difficult to be utilized by wheat plants.At different fertilization levels,the previous crop significantly affected the con-tent of TP,AP and Ca2-P,thereby affecting the phosphorus accumulation in winter wheat plants.
万方数据
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