红壤稻田脲酶消长规律研究

红壤田在晚稻生育期间脲酶活性从插秧到分蘖期逐渐升高，抽穗后逐渐下降，到收割后降至最低。不同类型麦活性大小为肥田〉中肥田〉瘦田。脲酶活性随土壤深度加深 农业生产上安排氮以的使用用本结果将尿素避开脲酶高峰期使用，以提高氮素利用效率。

A Study on Urease Growth and Decline Law inRed Soil Paddy Fields

Urease activity increases gradually from the transplanting to tillering stage, declines gradually after the earing stage and falls to the lowest point after reaping during the growth period of late rice in red soil paddy fields. The order of urease activity in different types of paddy fields is fertile land, moderately fertile land and poor land. Urease activity falls with the soil depth. The result suggests that the utilization of urea should avoid the urease peak period in order to increase the utilization efficiency of nitrogen element in the fertilizer.