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苏北地区甘薯栽培中的夏薯约占90%以上,因而决定了露地育苗是这一地区的主要方式。育苗期间因受早期低温限制,种薯发芽迟,出苗率也低,也有时由于低温影响造成种薯烂腐事故。为了达到及时早栽、合理密植与经济用种的要求,我们于1963年进行了塑料薄膜育苗试验。现将结果报导如下。 一 供试材料与方法 处理:(1)露地苗床加塑料薄膜(市售透明聚氯乙烯制品)。(2)露地苗床加玻璃复盖。(3)当地习用露地
Summer sweet potato cultivation in northern Jiangsu accounted for more than 90%, thus determining the open field nursery is the main way in this area. Due to the early low temperature limit during seedling, seed germination late, the emergence rate is also low, but also sometimes due to the impact of low temperature caused by crop rot. In order to achieve timely planting early, close planting and economic requirements of species, we conducted in 1963 plastic film nursery test. The results are reported below. A test materials and methods of treatment: (1) open field seedbed plus plastic film (commercially available transparent PVC products). (2) Open-field seedbed plus glass cover. (3) local practice of open field