园林树种在育苗过程中,除选择圃地适时播种外,还必须因时因地因树种制宜,在夏秋季节对苗圃采取以下管理措施:1.及时覆盖。播种后,一般可用稻草麦秆、谷壳等进行覆盖。以防床面土壤板结,保蓄水分,抑制杂草生长,避免烈日照射和暴雨冲击,调节地表温度,提高种子的发芽率。覆盖厚度以不见土面为宜。当 Garden tree species in the nursery process, in addition to timely selection of nursery sowing, but also because of the local time due to tree species, nurseries in the summer and autumn to take the following management measures: 1. Timely coverage. After sowing, generally available straw straw, chaff and other coverage. In order to prevent the compaction of bed soil, preserve moisture, restrain weed growth, avoid the sun exposure and rainstorm impact, adjust the surface temperature and improve the seed germination rate. Coverage to see the soil is not appropriate. when