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EFFECT OF NITROGEN ON GROWTH AND YIELD OF SUNFLOWER UNDER SEMI-ARID CONDITIONS OF PAKISTAN
Abstract
Two years field study was carried out with the objective to determine the effect of different levels of nitrogen (N) on growth, development, yield and yield components of sunflower (Helianthus annuus L.) hybrids under agro-climatic conditions of Faisalabad-Pakistan in spring 2008 and 2009. The experiments were laid out in randomized complete block design with split plot arrangement keeping hybrids in the main plots and N levels in the subplots with three replications. The net plot size was 4.2 m x 5.0 m. The results indicated that with increasing N rates, there was also increment in the total dry matter (TDM), grain yield and yield components while the oil content was negatively affected. There was higher grain yield during 2008 as compared to 2009, probably due to more rainfall in the formation of TDM than in the latter stages. Hysun-38 hybrid gave maximum TDM (13.51 t ha-1) and maximum grain yield (3.08 t ha-1). Minimum TDM (11.94 t ha-1) as well as grain yield (2.92 t ha-1) was observed from Hysun-33. Among different N rates
