PJB-2019-626
DEFICIT IRRIGATION AND NITROGEN EFFECTS ON CAULIFLOWER, WATER PRODUCTIVITY AND YIELD RESPONSE FACTOR
SOHAIL
Abstract
A field experiment was conducted to study the effect of deficit irrigation and nitrogen levels on growth and yield of cauliflower under drip irrigation at research farm, The University of Agriculture Peshawar Khyber Pakhtunkhwa. The experiment performed in the growing season of cauliflower. The experiment designed on split plot arrangement Randomize Complete Block Design (RCBD) having three replications. Total numbers of the experimental units were 36 and area of one plot was 4.5 m2. Soil moisture content was determined by volume basis before sowing and then by Frequency Domain Reflectometer at daily basis. Four irrigation and three nitrogen levels and their interaction studied. There were two factors, irrigation and nitrogen. Irrigation levels applied as I1, I2, I3 and I4 that were 100%, 75%, 50% and 25% of Full irrigation respectively. Each plot irrigated by their exact calculated time by the drip irrigation method. Daily rainfall data during research period recorded. Nitrogen levels applied as N1, N2, and N3 that were 20, 40 and 60 kgha-1, respectively. Results showed that different irrigation levels significantly affected number of leaves per plant (23), leaf length (29 cm), leaf weight (457 gm), plant height (59 cm), days to curd initiation (93), days to curd maturity (16), curd diameter (27 cm), biological yield (50 tons ha-1), curd yield (41 tons ha-1), harvest index (8.50 %) and water use efficiency (201 kgha-1mm-1). Higher levels of irrigation and nitrogen recommend to assessing the future highest production.
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