Samiano, Arsenio R. <br/><br/>
The agronomic performance of four Sesbania species as affected by phosphorus fertilizer and their influence yield of irrigated transplanted rice on an acid sulphate soil 

 - Bangkok :  Asian Institute of Technology,  1990 
 - 66, [6] p. 
 - Thesis ;  no. AE-90-42 .
 - Asian Institute of Technology.  Thesis ;  no. AE-90-42 .
<br/><br/> A thesis submitted in partial fulfilment of the requirements of the degree of Master of Science, School of Environment, and Development 
<br/><br/>Thesis (M.Sc.) - Asian Institute of Technology, 1990 
<br/><br/> 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..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. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rice--Research<br/>Fertilizers and manures