耕作和施肥对水稻土有机无机复合状况的影响

在紫色大眼泥水稻土上进行了半旱式垄作和常规水旱轮作及不同施肥条件下土壤有机无机复合状况的研究。结果表明,有机肥料的施用,能明显提高土壤有机碳和重组碳含量,并能提高原土复合量和降低原土复合度,提高复合体中结合态腐殖质的松/紧比和稳/紧比,且随有机肥用量的增加而增大。半旱式垄作更有利于土壤有机碳和重组碳的积累,原土复合度高出常规水旱轮作1～2%,并达70%以上的追加复合度,各种结合态腐殖质数量也明显较高。这是水稻土培肥中值得重视的一种耕作制度。

STUDIES ON THE ORGANIC-MINERAL COMPLEX STATE OF PADDY SOIL IN DIFFERENT CONDITIONS OF CULTIVATION AND FERTILIZATION

The organic-mineral complex state of purple paddy soil was studiedin the conditions of semi-arid ridge culture,paddy field and dry farmland rotation with different of manure and fertilizer in quantities.Thecontents of organic matter in soil and in complexes were obriouslyincreased when the manure applied to the soil.The quantity of organo-mineral complexation and the ratio loose/tight and steady/tight to stablycombined humus were raised and the degree of organo mineral complexation in soil was dropped due to the application of the manure.In the two different systems of cultivations,the semi-arid ridge culturewas more favorable for raising the quantity of organic matter in soiland complexes.The degree of organo-mineral complexation in the soilof semi-arid ridge culture was 1-2% more than that of other systems ofculture,the degree of additional complexing of organic matter amountsto 70% and more,and the content of various combined humus in heavy-fraction was remarkedly higher.