| The general growth characteristics of Hemerocallis flaua in east in Gansu is analyzed.At the same time,analysis is also made of the growth specific characteristics of Hemerocallis flaua under the mulching with different materials(plastic film and crop stalk) and its soil temperature-raising and moisture-keeping effects.The result show that adopting the measures of mulching during the winter has has obvious effects of raising soil temperature and keeping soil moisture.Mulching wtih plastic film can increase effectively soil temperature and reduce invalid soil moisture consumption during the non-growing season and thus enhance the growth progress of the vegetable,but finally result in a low yield and high cost.While muching wirh crop stalk can repress soil temperature rising too quickly in spring and reduce the soil moisture evaporation,prolonging the harvest period of yellow flower,so the yield is high and the cost is low.So to extend the techique of crop stalk muching can achieve high economic return with low cost. |