Rice yield, potassium uptake and apparent balance under long-term fertilization in rice-based cropping systems in southern China

文献类型： 外文期刊

第一作者： Zhang, Huimin

作者： Zhang, Huimin;Xu, Minggang;Shi, Xiaojun;Li, Zuzhang;Huang, Qinghai;Wang, Xiujun

作者机构：

关键词： Apparent K balance;Long-term fertilization;Potassium uptake;Rice yield

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Potassium (K) imbalances are of growing concern in southern China, where rice (Oryza sativa L.) is the primary food resource for a growing population. This study examined rice yield, K uptake and apparent balance under long-term fertilization in rice-based systems at four experimental sites, including both rice-rice as well as rice-wheat rotations. The experiments consist of four treatments: control (no fertilizer), nitrogen and phosphorus (NP), nitrogen, phosphorus and potassium (NPK), and NPK plus manure (NPKM). Across all sites, rice yields increased by 3-20% due to K fertilization (NPK vs. NP) and 4-20% due to manure application (NPKM vs. NPK). The mean internal K use efficiency (IE) was lower (32-56 kg kgp#) in treatments receiving K (NPK and NPKM) than in those without K application (36-91 kg kgp#control and NP). Estimated from the logarithmic model, a total K uptake of 38-212 kg hap# was needed to produce 3-7 Mg hap# of rice grain. The annual apparent K balances were negative (17-245 kg hap# yearp#), irrespective of mineral K application and site. But the negative K balance reduced by 27-88 kg hap# yearp# through application of mineral K in combination with manure. The higher negative apparent K balances under rice-wheat cropping system were related to the lower K application rate and the soils rich in K-bearing minerals, while the lower negative apparent K balances under rice-rice cropping system were related to the higher K application rate and the soils low in K-bearing minerals. We conclude that a re-adjustment of the current K application rate is needed to improve the long-term rice production in southern China.

分类号： TQ44

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