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Agronomic and physiological responses of rice (Oryza sativa L.) under different water management systems, fertilizer types, and seedling age
Thesis Abstract:
A field experiment was conducted from March to June 2013 at the farm of Agri Park, College of Agriculture, Central Experimental Station, Crop Science Cluster of the University of the Philippines Los Baños, College, Laguna to evaluate the agronomic and physiological responses of rice under different water management system, type of fertilizer, and seedling age. The two types of fertilizer (vermicompost and chemical fertilizer), water management (with and without standing water), and two seedling ages (10 and 14 days old) were the treatments in the experiment. Chemical fertilizer produced the highest plant height, number of tillers and number of productive tillers hill-1; longest panicle length, percent filled grains panicle-1; highest 1,000 grain weight and grain yield, leaf dry weight, total dry matter, leaf area index, net assimilation rate, and crop growth rate. Most of these characters significantly increased in 10-day-old seedlings with chemical fertilizer without standing water. The shorter phyllochron and higher root pulling resistance were observed in 10-dayold seedlings without standing water. There were no significant differences in the number of leaves on the main culm and HI due to fertilizer type, water managements, seedling ages, and their interactions. For the variety NSIC Rc 216, the use of 10-dayold seedlings grown without standing water with chemical fertilizer is the optimum condition for better growth and high productivity.