论文部分内容阅读
大白菜在北京蔬菜供应上占第一位,生长期短、单产高,但对气象因素的反应极敏感,虽能高产却难以年年稳产。为了夺取高产稳产,我们总结了历年来广大群众丰富的生产实践经验,弄清了不同气象因子对大白菜生长的影响,从而提出了相应的技术措施,供今后栽培大白菜时参考。 从1951—1976年,26年来,各种不利气象因素曾不时在大白菜苗期、莲座期、结球期陆续出现,导致三大病害流行,影响了产量。然而在同一年份、同样气象条件下,由于
Chinese cabbage in Beijing’s supply of vegetables take the first place, short growth period, high yield, but extremely sensitive to the reaction of the meteorological factors, although it is difficult to produce high yield stable year after year. In order to seize high and stable yield, we summed up the vast masses of people over the years experience in production practice and clarify the different meteorological factors on the growth of Chinese cabbage, and thus put forward the appropriate technical measures for future reference to the cultivation of Chinese cabbage. From 1951 to 1976, 26 years, a variety of unfavorable meteorological factors have emerged from time to time in Chinese cabbage seedling stage, rosette stage, the completion of the ball, leading to epidemics of the three major diseases, affecting the yield. However, in the same year, due to the same weather conditions