宁夏压砂地土壤水分动态及消耗规律分析

A Study on Soil Moisture Dynamics and Consumption Pattern for Watermelon Growing on Gravel-covered Mulched Field in Ningxia

通过田间试验分析不同灌水条件下压砂农田土壤耗水及全生育期土壤水分变化规律,结果表明:压砂农田一次性灌水15 mm左右能够有效提高土壤水分,可满足压砂瓜近10 d的水分需求;压砂瓜全生育期内存在4个较明显的需水关键期,其中以变瓤期和成熟前期对土壤水分需求最大;不同年限的压砂农田其土壤水分存在一定差异,通常老砂地(压砂10年以上)水分含量高于新砂地。

The field experiments are carried out to analyse the soil water deprivation and water requirement of crops during the whole growth stages under different irrigations in gravel-covered mulched fields. The result showed that 15mm one-time irrigation can improve the soil moisture around and it can be to meet the water needs for nearly 10d. The water requirement has 4-sensitive period during the watermelon growth, in which the greatest demand for moisture occurred during the early stage of flesh and maturity. There are some differences between soil moisture in the gravel-covered mulched field in various years. Normally water content is higher in aged fields （above 10 years old） than that in the new fields.