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Northwest University of Science and Technology (2002)

Theory and Practice of Micro-water Harvesting Technique on Potato Field in Semi-arid Area Agroecological System

WangXiaoLing

Titre : Theory and Practice of Micro-water Harvesting Technique on Potato Field in Semi-arid Area Agroecological System

Auteur : Wang Xiao Ling

Université : Northwest University of Science and Technology

Grade : Master 2002

Résumé
Potatoes of Nort hern regions (especially Inner Mongolia, Shanxi, Gansu, Ningxia and other regions) growing crops. As these areas are rich in light and heat resources, available potassium rich soil, soil texture coarser and therefore particularly conducive to the production of quality potatoes. The potato moisture conditions is also more in line with the characteristics of the rainfall season Rainfeed. From germination to the seedling stage, water demand, even in the face of severe spring drought, and fully rely on seed moisture and soil water storage in normal growth ; into the budding stage, especially after entering the flowering stage, the water demand increased dramatically, but it is also more rainfall in these regions season. However, in relatively dry years, rainfall is not able to meet the needs of potato growth, limit yield formation and improve constraints, shortage of water resources in these areas, it is difficult to achieve limited irrigation. Therefore, effective regulation and control of precipitation resources is an urgent need to address the theoretical and practical issues in potato cultivation. Ridge and furrow planting field micro domain-harvesting techniques in the field, the ditch as the sowing area, the ridge surface mulching as a catchment area, in order to achieve the rich resources of precipitation superimposed, increased planting soil moisture content, and rely on the part of the soil mulching and low-density planting, a cultivation methods to reduce the loss of soil moisture. The field of micro-domain catchment reported more the field micro domain catchment cultivation impact of potato production in the the ridge with film catchment growing conditions, soil nutrient availability, what changes at different growth stages of the crop dry matter and how the distribution of nutrients in different parts of the crop nutrient use efficiency of how the current lack of a rigorous trial evidence. In this study, using field micro-domain-harvesting techniques, that we have proposed in the study \Through research, made the following main conclusions or new insights : 1. Ridge coating catchment the field micro domain catchment soil water storage and potato growing season. Can increase soil water storage at the seedling stage ; little effect on soil water storage in the growth medium-term ; at a later stage, but also to a significant increase in the amount of soil water storage. Pre pondage increase mainly because part of the coating of the surface of the soil, reduce soil water evaporation losses ; After entering the mid-crop growth, due to low rainfall and severe drought, soil evaporation, coupled with crop growth on soil water consumption, resulting in the the pondage difference between the different treatment almost disappeared ; late in the crop growth, crop growth rate gradually slowed down, the rainfall in this stage more frequently, each new rainfall ridge with film set water treatment showed a the catchment significant effect and water effects, the the ridge with film set of water treatment, soil water storage is significantly higher than the level for soil ridge set water treatment

Mots clés : Ridge and furrow cultivation Mulching The field micro Domain catchment Potato Semi-arid areas

Présentation (Dissertationtopic )

Page publiée le 11 septembre 2014, mise à jour le 14 septembre 2017