Impacts of Nitrogen Fertilizer Sources, Amount and Timing on Yield and Yield Components of Potato
Subject Areas : Journal of plant ecophysiology
محمد رضا بهرامجردی
1
(گروه زراعت، واحد جیرفت، دانشگاه آزاد اسلامی، جیرفت، ایران)
Keywords: Fertilizer, Jiroft, rate, Tuber, Consumption time,
Abstract :
To obtain the optimum N fertilizer amounts, sources and timing for potato, we conducted an experiment in split plot-factorial form based on randomized complete block designs with 3 replicates in Jiroft city, located in the south of Kerman Province, Iran. In this study, we took into account N sources for the main plots and N fertilizer amount and time for the subplots. As to the N fertilizer consumption timings and the levels, T1 stands for the total consumption of N fertilizer during cultivation, T2 for consumption of 1/2 N at cultivation and the remaining 1/2 simultaneous with the beginning of flowering and T3 for of 1/3 N consumption at planting, 1/3 of N consumption coincided with the soil hilling and 1/3 at the same time as flowering; N rates were of the levels R1:150, R2:200 and R3:250 kg/ha. Sources were considered to be of two levels: S1=urea and S2-ammonium sulfate. According to our results, treatments were significantly different with regard to yields so as to obtain the highest yield from R3 treatment consumption at the rate 26.72 ton/ha, which statistically had no particular difference from R2 treatment with a rate of 23.86 ton/ha. In addition, the highest yield was obtained from the time T2 with the rate 30.83 ton/ha and from the source S1 the highest yield was 27.38 ton/ ha. Regarding such results, the highest yield belonged to the treatment R2S1T2.