Studied on legume yield increment on partial fertilized paddy field and effect of the legume on the following sequent rice yield.

 

Maratree (sukavatthanasombat) pliansirichai

E-mail: maratreep@yahoo.com.au

 

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Series of experiments were carried out to study the effects of different levels of 16-16-8 fertilizer on rice and cowpea which grown after rice.  The effects of residual fertilizer and cowpea green manure on the following season rice crop were also compared.

First experiment: Three rates of 16-16-8 fertilizer (0, 10, and 20 kg/rai) were applied to rice variety RD6.  The results showed no statistically difference among treatments both on growth and yield.  The highest yield of 254.89 kg/rai came from treatment, which received 20 kg/rai.  There were also no differences among yield components of the three treatments.

Second experiment: The effects of residual fertilizer from the first experiment on growth and yield of cowpea were measured.  A supplement of fertilizer 3-9-6 kg/rai (N-P₂O₅-K₂O) was added to all treatments.  There was no difference in seed yield of cowpea among treatments.  Soil analysis indicated that there were no residual effects from N and K While there was some residual P found in the plot, which received 20 kg/rai of fertilizer.

Third experiment:  This experiment was carried out to test effects of cowpea green manure (incorporated 1 month before sowing rice) and chemical fertilizer applied at the same rate as the previous experiment.  There was no difference in yield and yield components except number of grain per panicle.  Plant height and straw weight were also similar among treatments.

            It was concluded that this kind of study might have to be done on a long-term basis. 

 

 

 

 

Maratree