一、大豆栽培灌水的必要性 对于大豆栽培的最适土壤水分,有很多学者从与气象的关系以及地下水位的关系方面进行了探讨。对大豆的生育、产量的适宜水分,各试验结果不同,笔者认为是土壤中的空气条件(氧气)不同所致,通常pF是1.5～2.0左右。另外,气象条件与生育、产量之间,在播种后41天～60天的最高气温和日照时数之间为正,与降水量为负的相关关系, I. The Necessity of Soybean Cultivation and Irrigation For the optimum soil moisture for soybean cultivation, many scholars have discussed the relationship with the weather and the relationship between the groundwater level. Soybean fertility, yield suitable moisture, the test results are different, the author believes that the air in the soil conditions (oxygen) due to different, usually pF is about 1.5 to 2.0. In addition, the correlation between meteorological conditions and fertility and yield was positive between 41 and 60 days after sowing and between sunshine duration and precipitation,