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前言在水热资源丰富的地区提高复种指数,变一年一熟为两熟,变一年两熟为三熟,是提高土地利用率,延长光合作用时间,提高光能利用率,从而提高单位面积产量的一项有效措施。从贵州农业自然资源的气候条件看,年均温11～19.6℃,生育期200～340天,年降水量800—1400毫米,除南部与北部河谷区外,绝大多数地区年均温在15℃左右,适于农作物的一年两熟(见图1)。如黔中地区是贵州高原的主体,是全省最重要的粮、油、烟、茶生产区,≥10℃积温4000—5000℃,是麦玉两熟、季节略有盈余的地区,从玉米收后到种麦前约有两个月左右的空闲时间,在一年两熟的基础上,如何进一步挖掘季节的生产潜力,是生产、科研需要探讨的问题。为此,我们开展了旱地间套三熟制的试验研究,以探索熟制与土壤肥力,经济效益和物质输出和输入之间的关系。
Preface Increasing the multiple cropping index in areas rich in water, heat and heat, changing from one ripening to two ripening in one year and changing from two ripening to one ripening in one year can improve the utilization rate of land, extend the photosynthesis time, increase the utilization of light energy, An effective measure of area production. According to the climatic conditions of agricultural natural resources in Guizhou, the annual average temperature is 11-19.6 ℃, the growth period is 200-340 days, and the annual precipitation is 800-1400 mm. The average annual temperature is 15 ℃ in most areas except the southern and northern valley areas ℃ or so, suitable for crop two crops a year (see Figure 1). For example, Qianzhong is the main part of Guizhou plateau and is the most important grain, oil, tobacco and tea producing area in the province. The accumulative temperature of ≥10 ℃ is 4000-5000 ℃. It is a wheat-jade double crop with slight season surplus. It is about two months or so before the post-harvest wheat planting. On the basis of two crops a year, how to further excavate the productive potential of the seasons is a question that needs to be explored in production and scientific research. To this end, we conducted a pilot study on dryland cropping systems to explore the relationship between cooked and soil fertility, economic benefits and material output and inputs.