Response of kangkong to various levels and methods of nitrogen application

Abstract

A field experiment was carried out at the Agricultural Research Station, Raikhali, Rangamati Hill District during the summer seasons of 2004 and 2005 to determine the best dose of N and method of its application for kangkong production. The treatments consisted of five N levels i. e., 0, 50, 100, 150, and 200 kg/ha and five methods of N application i. e., entire dose applied as basal, one-third of the dose applied as basal and the rest after first cut, one-third of the dose applied as basal and the rest after each cut in equal splits, one-third of the dose applied as basal and the rest after alternate cut in equal splits and full dose after each cut in equal splits. Application of 200 kg N/ha and the method of one-third N applied as basal and the two-thirds after alternate cut in equal splits independently gave maximum vegetative growth and foliage yield, while 150 kg N/ha and one-third N applied as basal and two-thirds after alternate cut in equal splits in combination produced maximum values for growth parameters and foliage yield. The same combination also gave maximum gross return of Tk. 344.25 thousand/ha with the highest benefit-cost ratio of 49.31. Bangladesh J. Agril. Res. 32(2) 2007: 205-213.