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采用育苗移栽的方法栽培大白菜,可以延长上茬蔬菜的供应期,苗期便于管理。在直播不易齐苗的地块,增产效果尤为显著。大白菜种子萌发的最适温度是18—25℃,在26—30℃时发芽迅速但幼苗虚弱,出苗后易死亡。我省直播大白菜下种时正值地温最高季节,常高于25℃,生产中采用浇井水可降低地温,但普及推广尚有一定困难。因此,采用遮光育苗的方法便于克服不利因素。遮光育苗的设备可因地制宣,遮荫物用竹劈子、苇子、秫秸等物编织成花荫帘,或用工业专门生产的遮荫帘,还可用透光率很低的旧塑料薄膜。支撑遮荫物的骨架可用小拱棚骨架(苗床设在露地);如苗床设在温室内,可将遮荫物直接放到温室玻璃上面,使
The method of transplanting seedling cabbage cultivation, can extend the supply of vegetables on the stubble, seedling easy to manage. In the plot is not easy to live Qi Miao, yield increase effect is particularly significant. The optimum temperature for germination of Chinese cabbage is 18-25 ℃, germination is rapid at 26-30 ℃ but seedling is weak, and it is easy to die after emergence. Live broadcast cabbage in our province when the highest temperature is the highest season, often higher than 25 ℃, the production of water can be used to reduce the ground temperature, but popularization there are still some difficulties. Therefore, the use of shading seedling method to facilitate the elimination of unfavorable factors. Shading seedling equipment can be declared because of the system, the shade of bamboo with bamboo, reed, straw and other objects weave into a shade curtain, or industrial use of special shade curtains, but also with low light transmittance of the old plastic film . Skeleton supporting the shade can be a small shed skeleton (seedbed located in the open); such as seedbed in the greenhouse, the shade can be placed directly on the greenhouse glass, so that