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1.安全隔离大白菜一代杂种制种,安全隔离是基础。为确保种子纯度,制种田周围2000米之内,必须确保没有苔菜、油菜、各种小白菜、大白菜等易串花蔬菜的留种。 2.适期播种,培育壮苗 (1)建畦。选择没有种过白菜的肥沃田块,于11月下旬封冻前将风障、阳畦做好。要求东西向,每公顷制种需苗床450平方米,北墙高40～50厘米,南墙高8～10厘米;畦内要经常刨、翻、晒土。播种前每15平方米阳畦要均匀撒施腐熟的优质圈肥250公斤;三元
1. Safe isolation Chinese cabbage generation seed production, safety isolation is the foundation. In order to ensure the purity of seeds, we must ensure that there is no species of Brassica oleracea, rapeseed, cabbage, Chinese cabbage and other easy-flowering vegetables to be planted within 2000 meters around the farmland. 2. Sowing time, nurturing strong seedlings (1) Jian 畦. Choose not to have planted cabbage fertile plots, the wind before the block in late November, the wind,, Yang 畦 well. Requires east-west, seedbed per hectare seedbed needs to be 450 square meters, the north wall 40 to 50 cm high, the south wall 8 to 10 cm high; 畦 often to dig, turn, soil. Before sowing every 15 square meters of sunburnt should be evenly applied rotten quality circle fertilizer 250 kg; ternary