Effects of different plant density and nitrogen application rate on nitrogen use efficiency of potato tuber
Young Researchers Club, Department of Agronomy, Faculty of Agriculture, Islamic Azad University, Ardabil Branch, Ardabil, Iran.Pakistan Journal of Biological Sciences 09/2008; 11(15):1949-52. DOI: 10.3923/pjbs.2008.1949.1952
In order to investigate the plant density and nitrogen level on nitrogen use efficiency components (agronomical, physiological, apparent recovery and nitrogen use efficiency), the amount of nitrogen uptake by plant, yield and yield components of potato (Solanum tuberosum L.) Agria cultivars' tuber, a factorial experiment based on randomized complete block design was conducted in Ardabil, Iran, in 2006 with three replications. Factors were adjusted for the nitrogen level (0, 80, 160 and 200 kg ha(-1) net nitrogen) and plant density (5.5, 7.5 and 11 plant m(-2)). Results showed that with increasing the nitrogen levels and plant densities agronomical nitrogen use efficiency, physiological nitrogen efficiency and nitrogen use efficiency were decreased and apparent recovery nitrogen efficiency was increased. The most nitrogen uptake in plant was observed at the 200 kg ha(-1) net nitrogen. The most yield and number of tuber per unit area were gained at the 80 and 160 kg ha(-1) net nitrogen. Increasing the plant density resulted in increasing in the tuber yield per unit area and the rate of nitrogen up to the 160 kg ha(-1) net nitrogen. So, application of the 80 kg ha(-1) net nitrogen and plant density of 11 plant m(-2) is recommended to get highest yield with the most nitrogen use efficiency.
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ABSTRACT: A field experiment comparing different drip irrigation regimes and plant arrangements on potato yield and its component, leaf, stem and total dry matters, harvest index and water-use efficiency was carried out in a clay soil. This study was carried out on the experimental Farm of Ardebil Agriculture Research Station in 2006. The experiment included three treatments for different drip irrigation regimes: I1 (full irrigation), I2 (80% of full irrigation), I3 (60% of full irrigation) and three treatments for plant arrangements: conventional cultivation (P1), two rows 35 (P2) and 45 (P3) cm apart on a wide bed 150 cm. Results indicate that both drip irrigation regimes and plant arrangements didn’t influence the harvest index. In all varieties, I1, I2 and I3 produced the lowest amounts, respectively. Plant arrangement hadn’t significant impress on tuber yield, numbers and average weight of tubers. P3 and P2 treatments produced maximum and minimum values in more characteristics. The yield of tuber, leaf, stem, total and harvest index indicated increasing trend during the harvest times and only the stem and leaf yield decreased at the two final harvests. In most variables interaction effect of the (I1xP3) generated. Accumulative amounts of reference and 100, 80 and 60% crop evapo-transpiration (EP) were 782.2, 627.6, 502.0 and 376.5, respectively. Water Use Efficiency (WUE) with increase water supply improved. Treatment of I1xP3 had the highest WUE. Its values during growth period increased and maximum WUE obtained at 109 Day after Planting (DAP).
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