EFFECT OF APPLIED PHOSPHORUS AND POTASSIUM AND THEIR INTERACTIONS ON BROCCOLI (brassica oleracea var. italica) YIELD AND SOME LEAF CHARACTERISTICS
This investigation was carried during October 2016 to February 2017 at Grdarasha field ,College of Agriculture University of Salahaddin ,Erbil with GPS reading of (N =360 06’ 49’’ E=440 00 ‘ 47’’ and Elevation 407m )to study the effect of 5 water levels of triple super phosphate(TSP ) (0,50,100,150 and 200 kg ha-1) and two levels of KCl (0,150 kg ha-1) which equivalent to (0 ,11.25,22.5 33.75 and 45 g TSP plot-1) ,( 0 and 33.75 g -1KCl) plot respectively and their interaction on growth and yield of broccoli (Agassi F1 hybrid),using Randomized Complete Block Design (RCBD) with 4 replicates. The constant amount of urea (100 kg ha-1 which equivalent to 11.25 g) urea per experimental unit was added to each experimental unit. Significant differences were observed for all the traits studied. The levels of applied P affected significantly at level of significant 0.05 on broccoli yield, the highest value (23.15 Mg ha-1 was recorded from P4 treatment, while the lowest value (14.50 Mg ha-1) was obtained from control treatment (P0). Also, the application of potassium caused significant increase in broccoli yield the lowest and highest values (17.24 and19.08 Mg ha-1) were recorded from K0 and K1 treatments respectively. Their interactions affected significantly at level of significant 0.01 on SPAD values of broccoli. The highest values (74.3, 75.6 and 76.2) SPAD were recorded from K1, P3 and P3K0 respectively. Leaf contents of macro nutrient were recorded a significant difference with interaction effect of both Potassium and Phosphorus, the highest level of concentration recorded was for interaction treatment P4 K1 which were (37.80, 3.98 and 2.25) mg g-1 dry matter for Nitrogen, Phosphorus and Potassium respectively. The application of fertilizers and their interaction caused 59.65,10. 67 and 95% increase in broccoli yield respectively comparing with control treatment.
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