Phosphate fertilization and mocrobial inoculation on lettuce yield grown in high phosphate soils
1998
Thunvarat Wajanawongvijit
Phosphate fertilization and inoculation of phosphate solubilizing soil microorganism on the soils which used for vegetable and fruits was studied. The soils were collected from Asparagus field, Bitter gourd field and coconut field located at Amphoe Dumnoen Saduak, Rachaburi. One lettuce plant was grown on 1 kg of the soil. The experiment were 3*2*2 factorial in randomized complete block designed with 4 replications. The treatments were three soils with and without phosphate fertilizer, with and without phosphate solubilizing soil microorganism. The lettuce was grown for 3 successive crops. The fresh weight, dry weight and the number of leaf, concentration and uptake of phosphorus, iron, manganese, copper and zinc in the soils and plants were recorded. The results of the experiments showed that the response to phosphate fertilizer of lettuce was noted at the second and third, not the first crop. There were no benificial effect of the phosphate solubilizing soil microorganism on the growth of lettuce for all three successive crops. The fixation of iron, manganese, copper and zinc due to high phosphate content in the soils were not found. Thus, resulting in sufficient content in the soils and plants. The phosphate fertilization enhanced the uptake of iron, manganese, copper and zinc at the second and third crop of lettuce cultivation. The enhancing effect of copper uptake was also increased except the lettuce grown in the soil collected from bitter gourd field. The enhancing effect of copper and zinc uptake was not shown at the first cropping. On the other hand, the phosphate fertilization reduced the iron uptake.
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