期刊
FIELD CROPS RESEARCH
卷 214, 期 -, 页码 38-44出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fcr.2017.08.025
关键词
Potassium; Soil available K; K depletion; Apparent K balance; Soil-extractable K
类别
资金
- National Key Research and Development Program of China [2016YFD0200108-3]
- National Basic Research Program of China [2013CB127401]
- Jiangsu Province Science Foundation for Youths [BK20161093]
- 13th Five-Year Plan in the Institute of Soil Science, Chinese Academy of Sciences [ISSASIP1649]
Large areas of the arable soils of the world are deficient in potassium (K) due to the low application rate of K fertilizer. However, current soil test methods cannot precisely determine soil available K changes. From 2009 to 2014, a field experiment was conducted in a rice wheat cropping system in the Yangtze Plains using five K rates. The objectives were to determine the responses of wheat and rice yield to different K rates and to compare the soil available K changes extracted by three methods (ammonium acetate (NH4OAc), boiling nitric acid (HNO3), and sodium tetraphenylboron (NaTPB)). Long periods without application of K fertilizer markedly decreased wheat yield by 47% and rice yield by 15% compared with local farmers' K practices (FKP, 90 and 120 kg K2O ha(-1) for wheat and rice, respectively). The FKP achieved optimal yields for wheat and rice; however, only 160% of FKP achieved a positive K balance for the cropping system. Soil-extractable K consistently decreased with increasing cropping rotations where the K rate was below 160% FKP for the three extraction methods. The extractable and changed amounts for the NH(4)OAC and HNO3 methods were significantly lower than that for the NaTPB method. The soil K changes for NaTPB were closer to the theoretical soil available K changes (TAKC) derived from an apparent K balance. The NaTPB method could be useful for accurately determining changes in soil available K in cropping systems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据