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用连续10次水稻耗竭盆栽试验,探讨了湖北省15种主要类型水稻土不同形态钾占土壤全钾含量的比例。结果是,难风化的白云母和长石类矿物中含钾量平均占90.0%;缓效钾平均占3.34%;有效钾贮量平均占11.1%;交换性钾平均占0.871%。盆栽水稻吸钾量与交换性钾和有效钾贮量呈极显著相关(r=0.7659,0.7695),与缓效钾贮量呈显著相关(r=0.6032)。这也间接证明难风化钾矿物不是钾源的提供者,从有效钾贮量看并不丰富,特别是鄂南地区稻土尤甚。强化钾素在农业内部循环,这才是有效利用土壤钾资源的重要措施。
With 10 successive rice pots depletion experiments, the proportions of different forms of potassium in 15 kinds of paddy soils in total potassium in soils were discussed. As a result, the average potassium content in the less weathered muscovite and feldspar minerals was 90.0%; the slow-acting potassium was 3.34% on average; the effective potassium was 11.1% on average; and the exchangeable potassium was 0.871% on average. Potassium absorption of potted rice was significantly and significantly correlated with exchangeable potassium and available potassium (r = 0.7659, 0.7695), and significantly correlated with slow potassium storage (r = 0.6032). This also proves indirectly that the potassium-indissoluble potassium mineral is not the source of potassium source, which is not rich from the available potassium storage, especially in the paddy fields in southern Hubei Province. Strengthening potassium internal circulation in agriculture, which is an important measure to effectively use soil potassium resources.