Field studies also showed that proper concentration of polymers could effectively improve water supply and moisture holding capacity, so as to improve the survival rate of seedlings.
野外应用表明，适当浓度的保水剂可以有效提高土壤保水能力和供水能力，提高苗木根冠比和成活率。
2
This indicates that photosynthetic rate has the threshold response to soil moisture and the threshold value is about 65% of fieldcapacity.
说明光合作用对土壤水分存在一个“阈值”反应，此值为土壤田间持水量的6 5%左右。
3
The effects of wilting point, fieldcapacity and initial amount of available soil moisture in root zone on soil moisture were positive.