Fertilizer has become a major input in rice production around the world. As its use has grown, traditionally used organic materials such as farmyard manure and green manure crops have been increasingly neglected.
Farmers have become more and more dependent on off-farm supplies, which require cash and may not always be available on time
The harmful effects on the environment of heavy and improper use of chemicals are becoming more evident. Further, the fossil fuels used in the production of nitrogen fertilizers are becoming scarcer. At the same time, the demand for rice is going up as populations increase, particularly in Asia
Thus, interest in sustainable farming—using renewable resources easily and cheaply available on the farm—is growing. Such a system maintains soil fertility as far as possible by the traditional biological means—rotating cereal crops with legumes, recycling manure and other organic wastes, using green manures—and combining these with moderate amounts of chemical fertilizers. Research has shown such combinations to be more effective than any single nutrient source in improving soil quality and nutrient use efficiency, and thus yields.
Such a system Is also more environmentally sound than one that relies solely on chemical fertilizers.
This book outlines the whys and hows of integrating organic and chemical fertilizer use. emphasizing the growing of green manure crops.
About 50 legumes suited to a wide range of rice-growing environments are described so that farmers may choose the ones best for their own needs. Most are multipurpose crops that not only will replenish soil nutrients but will also provide food, fodder, fuel, and extra income for the rice farmer.
The book was edited by Vrinda Kumble. Editorial Consultant Services, New Delhi, India, with special illustration by John Figarola, IRRI Communication and Publications Department. The book is designed to facilitate translation and copubhcation.
[EBOOK] A Primer on Organic-Based Rice Farming, R. K. Pandey, International Rice Research Institute (IRRI)
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Keyword: ebook, giáo trình, organic, Based Rice Farming, integrating organic and chemical fertilizer use, growing of green manure crops, legumes suited, phân xanh, phân hữu cơ, phân bón cho lúa, cây họ đậu làm phân xanh
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