稻田养鸭、养鱼能明显改善土壤物理性状，提高土壤的通气性。
Raising duck or raising fish in rice field can clearly improve soil physics properties and the soil aeration.
结果表明，造纸黑液适量施用能改善土壤物理性状，增加土壤有机质含量和氮、钾含量；
Results show that the proper application of black liquor of papermaking can improve the soil properties and increase the contents of organic materials, N and K in soil.
但生产内容单调，多数为纯粮型种植结构，经济效益不高，不利丰富社会产品和改善土壤物理性状。
But the low benefit of mono - cereal cropping structure is their main weak point which are unfavourable for providing plentiful agricultural products and improving the physical character of soil.
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