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白菜播种后,首先搞好苗期管理,保证苗齐、苗壮,保护根系不受损伤,保持有充分的营养培育壮苗,避免高温干旱对幼苗的为害,以防病毒病的发生。栽培技术措施是浇水降温,防止生长前期干旱。定植前先进行浇水造墒,改善田间小气候。干旱年份做到三水齐苗,五水定苗。苗齐后要及时间苗适时定苗。一般以一叶一心和3～4片真叶时分别两次间苗。8～9片真叶时定苗。结合间苗偏施间苗肥,以亩施硫铵7.5公斤为宜,并浇好间苗水及时中耕保墒,保持田间“见干见湿”为宜。在蚜虫迁飞时及时喷40％乐果乳剂1000倍液防治蚜虫传毒。 白菜进入蓬座期,主要促外叶生长和根系的发育,控制霜霉病发生,主要栽培措施是:定苗后距根部13～16厘米处开沟集中施入腐熟粪尿,施肥后立即浇水,如不追施此次发棵肥,易造成莲座期叶子生长不良(结球期补追也不能挽救)。浇水后地稍干立即中耕蹲苗,促使根条深扎,防止外叶徒长,蹲苗到外叶深绿油亮、叶盘肥大时结束,一般15天左右。蹲
Cabbage sowing, the first to do a good job of seedling management, to ensure Miao Qi, Miao Zhuang, to protect the root system from injury, to maintain adequate nutrition nurturing strong seedlings, to avoid high temperature and drought damage to seedlings in order to prevent the occurrence of viral diseases. Cultivation measures watering and cooling to prevent pre-growth drought. Watering before planting planting moisture, improve the field microclimate. Sanshui Qi Miao dry years to do, Wuding Ding Miao. Miao Qi after time and time to be timely Dingmiao. Generally one leaf and one heart and 3 to 4 true leaves were twice between Miao. 8 to 9 true leaves Dingmiao. Combined with Miao Miao Shi Miao between the facilities, to 7.5 acres of ammonium sulphate appropriate, and pouring water Mianmiao promptly cultivating soil moisture, maintaining the field, “see dry to see wet” is appropriate. In aphids flying fly sprayed 40% dimethoate 1000 times prevent aphid poisoning. Cabbage into the tentage, mainly to promote the growth of the outer leaves and root development, control downy mildew occurs, the main cultivation measures are: Dingmiao 13 ~ 16 cm away from the roots of the ditch concentrated into the cooked manure urine, watering immediately after fertilization , If not topdressing the hair manure, easily lead to poor growth of rosette leaves (catch up catch up can not be saved). Watering a bit dry immediately cultivate Dunmiao, prom dresses, roots deep bar, to prevent the outer leaves are long, squat seedlings to the outer leaves of dark green, leaf disc hypertrophy end, usually about 15 days. squat