论文部分内容阅读
2008年对宁波市郊水稻土的供钾能力进行测定和评价。结果表明,28年来宁波平原水稻土速效钾含量有所降低,从1980年第2次土壤普查时的108.1 mg.kg-1,下降到98.2 mg.kg-1,下降了9.2%;如果按水稻速效钾临界值为80 mg.kg-1来计算,则2008年有39.6%的点(畈)速效钾含量不足。探讨近28年来宁波市郊土壤速效钾下降的原因,并提出有效施用钾肥的意见。
In 2008, the potassium supply capacity of paddy soil in the suburbs of Ningbo was measured and evaluated. The results showed that the available potassium content of paddy soils in Ningbo plain decreased from 288.1 mg.kg-1 in 1980 to 98.2 mg.kg-1, down by 9.2% Available potassium critical value of 80 mg.kg-1 to calculate, then in 2008 there are 39.6% point (畈) available potassium content is insufficient. The reasons for the decline of available K in soil in the suburbs of Ningbo in recent 28 years are discussed, and the suggestion of applying K fertilizer effectively is proposed.