SOIL NUTRIENT DYNAMICS, GROWTH AND YIELD PERFORMANCES OF MUNG BEAN (Vigna radiata (L.) Wilczek) UNDER DIFFERENT ORGANIC MANURE APPLICATION ON NON CALCIC BROWN SOIL A. W. Farween1, A. G. Chandrapala2, R. M. P. Rajakaruna1
1Department of Soil and Water Resources Management, Faculty of Agriculture, Rajarata University of Sri Lanka, Puliyankulama, Anuradhapura, Sri Lanka. 2Regional Agricultural Research and Development Center, Aralaganwila, Polonnaruwa, Sri Lanka.
A field experiment was conducted at Regional Agricultural Research and Development Center, Aralaganwila, to study the soil nutrient dynamics and growth and performance of Mung bean (Vigna radiata (L.) Wilczek) under different organic manure on Non Calcic Brown (NCB) soil. Gliricidia (Gliricidia sepium), Ipil-ipil (Leucaena leucocephala), Guinea grass (Panicum maximum), rice straw, cattle manure, poultry litter and compost incorporated at the rate of 10 t/ha, was tested in a randomized complete block design with three replicates.
Litter bag technique was used to determine the rate of organic manure decomposition and nutrient release. Eight litter bags per plots were buried. One bag was retrieved from each plot at one week interval for the period of eight weeks. Gliricidia (6.8g/week - decomposition rate and 4.7 weeks - half life) recorded highest decomposition rate and shortest half life. However, Guinea grass recorded the highest amount of P release after one week of incorporation, while Gliricidia recorded the highest K and compost recorded highest N release. Highest amount of remaining N was recorded in Ipil-ipil (37.2%) while poultry litter recorded the highest amount of P (3.8%) and Guinea grass recorded the highest amount of K (34.8%) after the 8 week of incorporation. Incorporation of poultry litter showed highest plant height (29.5 cm), number of leaves per plant (13.2) and seed yield (952.2 kg/ha) of Mung bean. Although some other organic manure recorded the higher decomposition...