Effect of period of weed removal on growth and yield of mungbeans and soybeans in the central plain of Thailand

agricultural chemicals agronomic characters asia biological development cover plants crops economic plants feed crops feed legumes fertilizers foods grain crops grain legumes green manures growth industrial crops legumes mung beans oil crops pest control physiographic features physiological functions physiology plains plants productivity profitability protective plants soil amendments soybeans thailand vegetable crops vegetable legumes weed control yields