AI SearchThe agronomic performance of four Sesbania species as affected by phosphorus fertilizer and their influence yield of irrigated transplanted rice on an acid sulphate soil
Call Number: AIT Thesis no.AE-90-42 Material type:
SeriesSeries: Asian Institute of Technology. Thesis ; no. AE-90-42Publication details: Bangkok : Asian Institute of Technology, 1990Description: 66, [6] pSubject(s): Online resources: Dissertation note: Thesis (M.Sc.) - Asian Institute of Technology, 1990 Summary: The agronomic performance of four leguminous green manure s p e c i es ~f.?...?J!a rt ~i <-"!. r-o ~lLsl t c:Lt:.. f.~ .. -""ls_~J_J..{u00A7}ti:.!.l:..fu_ [~.f! __ <;.._tlJ.:..K..€.!El.Y_ and B f;...h .i. n<EJ. we r e evaluated as pre rice green manure on an acid sulphate s oil. Phosporous (triple superphosphate) was basally applied at the rate of 0, 50, and 100 kilograms per hectare respec tively to determine its effect on the growth and d eve lopment of these Ellf.i!.:~fl:L~!.1L ~.. The rice variety RD-23 was transplanted one week after incorporation of green manure. Nitrogen fertiliz er was topdressed at the rate of 0, 20, 40, and 80 kilograms p e r hectar e to determine the response of rice crop to added inorganic N fertilizer. The results show that all the species of green manure wer e photosensitive and flowered 35 days after emergence. Significant differences were observed on some agronomic characteristics. With added P, the plants were taller, more nodule s were produced, and highe r biomass was obtained than from the control. No s ignificant differences was obtained ·in any paramet e r as the rate of application of P was increased from 50 to 100 kilograms per hectare. Biomass production was greatly affected by date of planting of green manure. Green manure planted in March has a higher biomass produced than those planted in November, and their N accumulation in all the species was hig h. With added inorgani c N, the grain yield, the weig ht of 1,000 grains, tiller number and straw yield were increased .This relationship was found to be linear a s the rate of applied N is increased. The grain yield, the straw yield, and the plant heights were significantly higher with 80 kg of N applied . The N and P uptake increased in both the rice grain and the straw with increased levels of applied P and N . However, higher N and P uptake was observe d in the grain than in the straw.
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A thesis submitted in partial fulfilment of the requirements of the degree of Master of Science, School of Environment, and Development
Thesis (M.Sc.) - Asian Institute of Technology, 1990
The agronomic performance of four leguminous green manure s p e c i es ~f.?...?J!a rt ~i <-"!. r-o ~lLsl t c:Lt:.. f.~ .. -""ls_~J_J..{u00A7}ti:.!.l:..fu_ [~.f! __ <;.._tlJ.:..K..€.!El.Y_ and B f;...h .i. n<EJ. we r e evaluated as pre rice green manure on an acid sulphate s oil. Phosporous (triple superphosphate) was basally applied at the rate of 0, 50, and 100 kilograms per hectare respec tively to determine its effect on the growth and d eve lopment of these Ellf.i!.:~fl:L~!.1L ~.. The rice variety RD-23 was transplanted one week after incorporation of green manure. Nitrogen fertiliz er was topdressed at the rate of 0, 20, 40, and 80 kilograms p e r hectar e to determine the response of rice crop to added inorganic N fertilizer. The results show that all the species of green manure wer e photosensitive and flowered 35 days after emergence. Significant differences were observed on some agronomic characteristics. With added P, the plants were taller, more nodule s were produced, and highe r biomass was obtained than from the control. No s ignificant differences was obtained ·in any paramet e r as the rate of application of P was increased from 50 to 100 kilograms per hectare. Biomass production was greatly affected by date of planting of green manure. Green manure planted in March has a higher biomass produced than those planted in November, and their N accumulation in all the species was hig h. With added inorgani c N, the grain yield, the weig ht of 1,000 grains, tiller number and straw yield were increased .This relationship was found to be linear a s the rate of applied N is increased. The grain yield, the straw yield, and the plant heights were significantly higher with 80 kg of N applied . The N and P uptake increased in both the rice grain and the straw with increased levels of applied P and N . However, higher N and P uptake was observe d in the grain than in the straw.
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