Growth, yield and nutrient concentration of two rice varieties treated with four levels of salt and nitrogen [Philippines]
1984
Patricio, H.G.
The results show that the soil solution EC increased, whereas pH decreased with increasing salinity. The different salt levels also significantly delayed flowering and harvesting, depressed growth and yields, and generally increased the concentrations of nitrogen, phosphorus, sodium and chlorine, but decreased potassium concentration in the straw of both varieties. Varietal response to applied nitrogen, showed that in terms of straw yield, IR 52 responded more to the application of 90 kg N/ha whereas IR 26, to 135 kg N/ha application. Furthermore, fertilization with 90 and 135 kg N/ha increased the concentrations of nitrogen in the root and of potassium and sodium in the straw of IR 52. The same nitrogen levels increased the concentrations of phosphorus in the grain and of potassium in the straw of IR 26. The highest nitrogen rate (135 kg N/ha) increased chlorine concentration in the grain of IR 52, but decreased that of IR 26
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