【摘要】 在广东赤红壤地区不同土壤磷含量的菜园土进行菜心磷肥田间试验.根据18个试点的试验结果,提出了质地为中壤土的菜园种植菜心的土壤速效磷丰缺指标,菜心产量与土壤速效磷含量呈抛物线相关.施磷肥增产显著的菜田占68%,增产率为28%~51%;适宜的土壤速效磷(P)为54.6~87.8 mg.kg-1;低于此范围应补充磷肥,超过此范围应控制施磷肥.不同磷肥施用量试验结果表明,菜心产量与施磷肥量呈抛物线相关,在低、中、高肥力水平的菜园土种植菜心,要求菜心产量达到6 441~6 515、6 542~6 693和6 880~7 189 kg.hm-2时,推荐磷肥(P2O5)用量分别为50.0~76.5、50.0~72.6和50.0~64.1 kg.hm-2.更多还原

【Abstract】 The field trials of phosphate fertilizer on Brassica parachinensis were carried out in latosolic red soils with different available phosphorus in Guangdong.The results from 18 trial sites indicated that there was parabolic relationship between the yield of B.parachinensis and soil available phosphorus(P).Application of phosphate fertilizer in 68% of total field increased significantly average yield of B.parachinensis by 28%-51%.The reasonable content of P was 54.6-87.8 mg·kg-1,the soil below this range need phosphate fertilizer,while over this range,no phosphate fertilizer.The results of different phosphate fertilizer rates indicated that there was also parabolic relationship between the yield of B.parachinensis and application rates of phosphate fertilizer.To obtain the yields of 6 441-6 515,6 542-6 693 and 6 880-7 189 kg·hm-2 in the soils with the low,middle and high levels of soil available phosphorus,the recommended application rates of P2O5 was 50.0-76.5,50.0-72.6 and 50.0-64.1 kg·hm-2,respectively.更多还原