1 田块的选择及播前准备工作菜心根系浅,须根多,加上早春地温较低,宜选择土质疏松,有机质丰富、排灌方便、酸性小的砂质或砂壤土,有利于早期发苗。菜心是异花授粉作物,容易与其他白菜类蔬菜串粉,因此。在1000m之内禁止繁殖白菜、芥菜、薹菜、小油菜等种子。 Field selection and preparation before sowing Brassica campestris root shallow, fibrous roots, coupled with low ground temperature in early spring, should choose loose soil, rich organic matter, irrigation and drainage convenient, acidic small sandy or sandy loam, is conducive to early hair seedling . Brassica oleracea is a cross-pollination crop that is easily cross-linked with other cabbage vegetables. Prohibit the breeding of cabbage, mustard, sesame seeds, rapeseeds and other seeds within 1000m.