不同时期深施重肥对沙田柚生长结果的影响

比较了夏季深施重肥与冬季深施重肥对沙田柚春梢、根系生长及产量、果实品质、叶片与土壤营养含量的影响。结果表明,夏季深施重肥可在一定程度上提高沙田柚叶片钙、铁、硼、全氮、全磷、全钾、0~40cm土壤速效磷与有机质含量,以及20~40cm土壤的全氮、速效钾和pH值,为根系的生长创造良好的土壤环境条件,进而提高叶片三要素的含量,显著促进新根和春梢的生长;夏季深施重肥的单株产量、单果重量与果实品质与冬季深施重肥间无显著差异。

Effect of heavy subsoil application in different periods on the growing & bearing fruit of Shatian Pomelo

Heavy subsoil application for Shatian Pomelo in summer and in winter were studied to assess the effects on the growing of spring shoots and root system,yield,fruit quality and nutrition level in the leaves and soil. The results show that the content of elements such as Calcium(Ca),Ferrum(Fe),Boron(B),total Nitrogen(N),total Phosphate(P)and total Kalium(K)in leaves can be improved to a certain degree with heavy subsoil application in summer. The content of quick-dissolved Phosphate(P)and organic material in 0～40 cm-depth soil, and whole Nitrogen(N),quick-dissolved Kalium(K)and pH level in 20～40 cm-depth soil can also be increased. Therefore, better soil environment has been created for root growing, the content of 3 main elements-N,P,K in leaves has been increased,the growing of new roots and spring shoots has been promoted obviously. Heavy subsoil application for Shatian Pomelo in summer or winter makes no significant difference in single-plant yield,average fruit weight and quality.