论文部分内容阅读
在稻作为主的耕作制中,绿肥一般用作水稻作物的肥料。各种绿肥对环境的适应性不同,因而其在不同农业生态小生境中累积N的能力也各异。在一些环境中,某些绿肥能在二个月不到时间里累积150公斤以上的N/公顷。水稻对绿肥的反应主要与增加的有效N有关。绿肥能替代在水稻作物上施用100公斤以上的N/公顷。绿豆等籽实豆科作物的收获残余物也有增产稻谷的作用。由于在翻压后四个星期内,大多数绿肥N都已矿化,故在稻穗分化后,N可能成为限制因素。绿肥在第二季作物上的残效小,且有差异。每年翻压绿肥的土壤中,有机碳和全N含量增加。但这些增加在某些农业生态条件下对其它土壤参数和作物产量的影响研究不够。这方面研究提供的资料将使科研人员能够判断在稻作为主的耕作制中绿肥对持久农业生产的潜在贡献。如Sesbana rostrala这样一类鲜为人知的绿肥种类的潜力还需进一步研究。
In rice-based farming systems, green manures are generally used as fertilizer for rice crops. All kinds of green manure have different adaptability to the environment, and thus their ability to accumulate N in different agro-ecological niches is also different. In some environments, some green manure can accumulate more than 150 kg N / ha in less than two months. The response of rice to green manure is mainly related to increased effective N content. Green manure can replace the application of more than 100 kg N / ha on rice crops. Mung beans and other seeds of the harvest of legume crops also have the role of paddy production. Since most green manures N have been mineralized within four weeks after culling, N may become a limiting factor after panicle differentiation. Green manure in the second quarter of crop residues is small, and there are differences. Every year turn green manure soil, organic carbon and total N content increased. However, the effects of these increases on other soil parameters and crop yields under some agro-ecological conditions are not sufficiently studied. The information provided in this study will enable researchers to determine the potential contribution of green manure to long-term agricultural production in rice-based farming. The potential of a little-known green manure variety such as Sesbana rostrala needs further study.