Soil phosphorus dynamic, balance and critical P values in long-term fertilization experiment in Taihu Lake region, China

SHI Lin-lin; SHEN Ming-xing; LU Chang-yin; WANG Hai-hou; ZHOU Xin-wei; JIN Mei-juan; WU Tong-dong

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Soil phosphorus dynamic, balance and critical P values in long-term fertilization experiment in Taihu Lake region, China

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Phosphorus (P) is an important macronutrient for plant but can also cause potential environmental risk. In this paper, we studied the long-term fertilizer experiment (started 1980) to assess the soil P dynamic, balance, critical P value and the crop yield response in Taihu Lake region, China. To avoid the effect of nitrogen (N) and potassium (K), only the folowing treatments were chosen for subsequent discussion, including: C0 (control treatment without any fertilizer or organic manure), CNK treatment (mineral N and K only), CNPK (balanced fertilization with mineral N, P and K), MNK (integrated organic ma-nure and mineral N and K), and MNPK (organic manure plus balanced fertilization). The results revealed that the response of wheat yield was more sensitive than rice, and no signiifcant differences of crop yield had been detected among MNK, CNPK and MNPK until 2013. Dynamic and balance of soil total P (TP) and Olsen-P showed soil TP pool was enlarged signiifcantly over consistent fertilization. However, the diminishing marginal utility of soil Olsen-P was also found, indicating that high-level P application in the present condition could not increase soil Olsen-P contents anymore. Linear-linear and Mitscherlich models were used to estimate the critical value of Olsen-P for crops. The average critical P value for rice and wheat was 3.40 and 4.08 mg kg–1, respectively. The smaler critical P value than in uplands indicated a stronger ability of P supply for crops in this paddy soil. We concluded that no more mineral P should be applied in rice-wheat system in Taihu Lake region if soil Olsen-P is higher than the critical P value. The agricultural technique and management referring to acti-vate the plant-available P pool are also considerable, such as integrated use of low-P organic manure with mineral N and K.

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《农业科学学报（英文版）》 |2015年第12期|2446-2455|共10页
作者
SHI Lin-lin; SHEN Ming-xing; LU Chang-yin; WANG Hai-hou; ZHOU Xin-wei; JIN Mei-juan; WU Tong-dong;
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Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

Institute of Agricultural Science in Taihu Lake Region, Suzhou 215155, P.R.China;

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Soil phosphorus dynamic, balance and critical P values in long-term fertilization experiment in Taihu Lake region, China

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