Abstract
This research aims to obtain growth and yield characteristics of shallot due to three shallot varieties and phosphate fertilizer dosages on Ultisol. The experiment was conducted from July to September 2015 in Horticulture Main Seed Development Centre in Muaro Jambi district. Randomized block design used was arranged with two factors. The first factor was varieties e.i. Bima Brebes, Bauji, and Bangkok. The second factor was dosages of phosphate fertilizer e.i. 0; 125; 250; 375 kg P2O5 ha-1 . The growth and yield characteristics of shallot were different for each shallot variety and dosage of phosphate fertilizer. Bangkok variety had the highest Net Assimilation Rate (NAR), Specific Leaf Weight (SLW), bulb to leaf dry weight ratio and bulbs number. Bima Brebes variety had the highest Leaf Area Index (LAI), Crop Growth Rate (CGR), bulbs diameter, and bulbs weight whereas Bauji variety only had the highest Leaf Area Ratio (LAR). Optimum dosage of phosphate was different for each variety. The dosage of 375 kg P2O5 ha-1 at Bangkok variety of bulbs weight increased linearly. The highest weight of Bima Brebes bulbs variety was obtained with 21.62 g per hill at an optimum dosage of 246.11 kg P2O5 ha-1 .
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