【摘要】 <正> 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。更多还原

【Abstract】 Field experiments of row intercropping and relay interplanting of the strip of wheat (or rape), maize and sweet potato were carried out from 1977—1980 in Guiyang of Guizhou province. Experiments indicated that by taking best advantage of natural resources, developing the multiple cropping, selecting the most adaptive cultivars, and putting into the row intercropping and relay interplanting of the strip were the way to adjust the ecological structure and the function of farmland and to keep the dynamic equilibrium of ecological system. Row intercropping and relay interplanting may increase the productivity of farmland by improving the ecological environments of crops. Not only the Solar radiation will be utilized more efficiently but also the "auxiliary energy" may play a better role during the growing period of farm crops. It was the cause of the higher productivity of this farmland ecological system than that of any other ecological system. The results indicated that the maximum LAI increased 23.57% and the solar radiation energy to be utilized raised 0.4% (absolute value). Therefore, It gave the best yield among the various interplanted treatments and the increased productivity of three cropping was 81.30% more than the double cropping.更多还原