沙田柚配施钾镁肥效应研究  

Effect of combination of K and Mg on Shatian pumelo

作　　者：李国良[1] 姚丽贤[1] 周修冲[1] 张育灿 涂仕华 

机构地区：[1]广东省农业科学院土壤肥料研究所,广东广州510640 [2]广东省土壤肥料总站,广东广州510500 [3]PPI/PPIC成都办事处,四川成都610066

出　　处：《中国土壤与肥料》2007年第2期61-63,共3页Soil and Fertilizer Sciences in China

基　　金：中加国际合作项目与广东省成果转化启动项目(2005B60201003)资助

摘　　要：沙田柚为对镁敏感作物。由于忽视施用镁肥,在生产上较容易观察到沙田柚叶片缺镁症状。研究了在施用氮磷肥的基础上配施不同用量钾镁肥对沙田柚叶片营养、柚果产量、品质及效益的影响。结果表明,施镁可明显减轻沙田柚叶片的缺镁症状,提高叶片镁素营养;在土壤有效钾含量中等,有效镁含量缺乏的情况下,施用钾肥(K2O)340.2 kg/hm2基础上配施镁肥(Mg)22.5及45.0 kg/hm2,果实产量提高1.2%～18.7%,种植效益提高0.4%～24.7%;施用钾肥(K2O)453.6 kg/hm2基础上配施镁肥(Mg)45.0、81.0及117.0 kg/hm2,果实产量提高11.2%～31.7%,种植效益提高11.7%～39.4%,同时柚果品质得到改善。在施用钾肥(K2O)340.2、453.6 kg/hm2的基础上,推荐镁肥适宜配施用量分别以(Mg)45.0、117.0 kg/hm2为宜。Shatian pumelo is one kind of citrus and sensitive to Mg. Mg is ignorant to be used in shatian pumelo＇s production and leafy Mg - deficiency is easily to be observed. The influences of different combinations between K and Mg on leafy nutrition, fruit yield, fruit quality and plantation profits of shatian pumelo on the basis of applying N, P fertilizers were studied. The results showed that Mg application considerably alleviated Mg- deficient symptom and increased magnesium nutrition on leaf of shatian pumelo; while soil in the orchard contained medium K and lack of Mg, yield and plantation income of shatian pumelo comparatively increased by 1.2% - 18.7% and 0.4% - 24.7% at the level of the amount of potassium oxide 340.2 kg/hm^2 applying Mg 22.5 kg/hm^2 and 45.0 kg/hm^2; while yield and plantation income of shatian pumulo comparatively increased by 11.2 % ~ 31.7 % and 11.7% - 39.4% at the level of the amount of potassium oxide 453.6 kg/hn~ applying Mg 45.0 kg/hm^2, 81.0 kg/hm^2 and 117.0 kg/hm^2, and fruits quality was improved as well. On the basis of applying the amount of potassium oxide 340.2 kg/hm^2 and 453.6 kg/hm^2, the fitting amount of Mg combination application was 45.0 kg/hm^2 and 117.0 kg/hm^2.

关 键 词：沙田柚 钾肥 镁肥 平衡施肥 

分 类 号：S666.3[农业科学—果树学]