在广东赤红壤地区含钾量不同的菜园土上选择了20个试验点进行菜心钾肥田间试验,根据试验结果建立菜心相对产量与土壤速效钾含量的回归方程.结果表明:菜心相对产量与土壤速效钾含量呈抛物线相关.施钾肥后增产的菜田占90％,增产率为0.89％ ～47.2％;土壤速效钾(K)的适宜含量为144.5 ～225.4 mg/kg;菜心产量与施钾肥量呈抛物线相关,在低、中、高肥力的菜田上种植菜心,要求菜心达到6 501 ～6 626、6 755 ～6 985、6 869 ～6 993kg/hm2的最高产量水平,推荐的钾肥(K2O)用量分别为67.5 ～ 78.6、67.5 ～75.9、67.5 ～70.5 kg/hm2.%Field trials were carried out to study the effects of K fertilizer on Brassica parachinensis Bailey in the soils with different indigenous K contents in Guangdong latosolic red soil areas. According to the experimental results from 20 trial sites, a regression equation between relative yield of B. Parachinensis and soil available K content was established. The results indicated that their relationship was a parabola. The relative yield of 90% of the fields applied with K fertilizer increased and the growth rate reached 0. 89% -47. 2%. The suitable contents of available K in soil were 144. 5 -225.4 mg/kg, under which, K fertilizer should be added, but should be controlled if over it. The trial of different amounts of K fertilizer indicated that the relationship between the yield and the amount of K fertilizer was a parabola. According to the results, in order to gain 6 501 -6 626, 6 755 -6 985, 6 869 -6 993 kg/hm2 of yield, 67. 5 -78. 6, 67. 5 -75. 9, 67. 5 -70. 5 kg/hm2 of K fertilized K2O) are highly suggested to the fields with low, medium and high fertility, respectively.
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