ผลของการใช้ถั่วพุ่ม อะโซโตแบคเตอร์ อะโซสไปริลลัม และจุลินทรีย์ละลายฟอสเฟตที่มีต่อสมบัติบางประการของดินและการเจริญเติบโตของข้าวโพดหวานพันธุ์อินทรี 2 ในชุดดินกำแพงแสน

Abstract

2*3*3 factorial in RCBD was carried out with 4 replications. The first factor is green manure application that consisted 2 levels(no application and cow pea-green manure application), nitrogen fixers, the second factor, consisted 3 levels (non inoculation, azotobacter and azospirillum inoculations) and the last factor, phosphate solubilizer, consisted 3 levels(non inoculation, Glomus aggregatum and Bacillus megaterium inoculations). The results revealed that green manuring, nitrogen fixer and pHosphate solubilizer had no significant effect on nitrogen accumulation, pH, electrical conductivity of soil after harvest and sweetness index of sweet corn. Green manuring together with nitrogen fixer, particularly with azotobacter, enhanced the increasing of soil organic matter and available phospHorus levels. Inoculation of nitrogen fixers did not increase nitrogenase activity. Stem dry matter in the treatments those applied green manure, nitrogen fixer and phosphate solubilizer were higher than those of non application, but did not effect to the root dry matter. The high yield, with low under grade ears, was found in the treatment of green manuring together with G. aggregatum (2,266.50 kg/rai), green manuring together with azotobacter (2,153.00 kg/rai) and green manuring solely treatments (2,099.50 kg/rai). The minimum under grade ears(152.50 kg/rai) was found in the treatment that applied no green manuring, neither nitrogen fixer nor phosphate solubilizer.