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首页> 外文期刊>Soil Research >Comparative effects of crop residue incorporation and inorganic potassium fertilisation on apparent potassium balance and soil potassium pools under a wheat-cotton system
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Comparative effects of crop residue incorporation and inorganic potassium fertilisation on apparent potassium balance and soil potassium pools under a wheat-cotton system

机译：作物残留掺入与无机钾肥对小麦棉体系下表观钾平衡和土壤钾池的比较作用

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The objective of this study was to evaluate the effects of consecutive crop residue incorporation and potassium (K) fertilisation on plant-soil K balance, K forms, K release and K fixation capacity under wheat-cotton rotation at Nanjing and Dafeng in China. Six treatments were evaluated: control (without K input), wheat straw at 0.9 t ha(-1), cotton residue at 0.7 t ha(-1), wheat straw and cotton residue at the aforementioned rates, and 150 and 300 kg ha(-1) fertiliser K. Treatments in each rotation year had an identical rate of nitrogen and phosphate fertiliser application. The initial soil K content was higher in Dafeng than Nanjing. In the low K content soil of Nanjing, crop K uptake with double crop straw was significantly higher than that under single crop straw return or inorganic fertiliser, and K uptake increased with increasing K inputs. Only double crop straw or 300 kg ha(-1) fertiliser K treatments reached apparent K balance in Nanjing, but not in Dafeng. The high negative K balance resulted from the elevated K removal by crops in Dafeng. Incorporation of double crop residues favoured accumulation of different forms of K. Application of K fertiliser tended to increase soil water-soluble K, and crop residue incorporation greatly improved non-exchangeable K at a depth of 0-20 cm. Similar to K fertiliser, crop residue incorporation significantly increased soil K release and decreased K fixation at both sites. In summary, in a 3-year field experiment, crop residue incorporation and inorganic K fertilisation had similar effects on soil K pools and balance depending on initial soil K level and actual K input.
机译：本研究的目的是评估连续作物残留掺入和钾（K）施肥对南京和大丰的小麦棉旋转下的植物土钾钾的平衡，K形式，K释放和K固定能力。评估六种治疗方法：对照（无K输入），小麦秸秆在0.9 t ha（-1），棉渣在0.7 t ha（-1），小麦秸秆和上述速率下的棉渣，150和300 kg ha （-1）肥料K.每次旋转年份的治疗具有相同的氮和磷肥施用率。大丰的初始土壤K含量高于南京。在南京的低K含量土壤中，用双作物秸秆的作物K摄取显着高于单一作物秸秆返回或无机肥料下的摄影，并且随着k的增加，K摄取增加。只有双作物吸管或300公斤HA（-1）肥料K治疗在南京达到明显的K平衡，但不在大丰。高阴性k余量由大丰作物的k次升高引发。掺入双作物残留物的掺入有利于不同形式的K.施用钾肥倾向于增加土壤水溶性K，而作物残留物掺入大大改善过0-20厘米的不可换换k。类似于K肥，作物残留物掺入显着增加土壤K释放并减少两个位点的k固定。总之，在3年的田间实验中，作物残留掺入和无机K施肥对土壤K池和平衡相似，根据初始土壤K水平和实际k输入。

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