Effect of drip, microjets and basin irrigation method on growth, soil and leaf nutrient change in acid lime

摘要

A field experiment was conducted on acid lime (Citrus aurantifolia Swingle) during 1995-98 in an inceptisol with the objective of evaluating the comparative efficiency of micro-irrigation systems (dripper 81 h~(-1), microjet 3000 and microjet 1800)versus basin method of irrigation. The highest increase in plant height, stock girth and canopy volume was recorded in microjet 3000 followed by dripper and microjet 1800 irrigation system and basin method of irrigation. The yearwise changing pattern ofavailable N showed a reduction with all the treatments. However, the basin method of irrigation recorded 42.2 mg kg~(-1) available N compared to 6.9 mg kg~(-1) to 11.4 mg kg~(-1) using micro-irrgation systems. The available soil P improved in dripper andmicrojet 3000, but indicated depletion pattern in microjet 1800 and basin irrigation method. The available soil K improved with dripper and microjet 3000, but decreased with microjet 1800 and basin irrigation. But, changes in soil available nutrients did not show corresponding changes in leaf nutrient compostion. The results revealed that the growth and soil available nutrients buildup in rhizosphere of acid lime in micro-irrigation systems was superior over the conventional method of basin irrigation.