With the development of high density central district of our country, new situation and features crop up, which pose new challenges to street greenbelt design of central district.
随着我国高密度城市中心区的飞速发展，城市景观出现了新的面貌和特征，这对城市中心区街道绿地景观规划设计提出了新的要求。
Standardization of crop irrigation using the agrohydrological characteristics, such as texture, bulk density, soil moisture under the lowest water capacity and wilting moisture is investigated .
用土壤的农业水文学特征，如土壤质地、土壤容量、最低田间含水量和萎蔫下的土壤含水量对作物灌溉的规范化进行了研究。
The regression mathematical models for the yields of summermilletassociated with crop density, N and P fertilizers were established by using the optimal saturation D design.
研究采用二次饱和D-最优设计，建立了夏谷产量与密度、磷、氮肥的回归数学模型。
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