Influence of sources and rates of nitrogen fertilizer on production and chemical compositions of Guinea grass (Panicum maximum Jacq.) grown on Kamphaeng Saen soil series by using 15N technique
1995
Wanida Tongvinichsin
Pot experiment was conducted at the green house of the Soil Science Department Bangkhen Campus to determine the influence of N fertilizer sources (ammonium sulfate and urea) and N rates (0, 40, 80, 120 kg N/rai) on dry matter yields, N yields protein yield, P yield, K yield, recovery of labelled N and also the balance sheet of labelled N on Guinea grass (Panicum maximum Jacq.) grown on Kamphaeng Saen Soil Series. The Guinea grass was harvested 3 times in every 45 days. The experimental design was 2*4 Factorial in Completely Randomized with 3 replications. The result from the experiment indicated that average dry matter yields, N yields, protein yields, P yields and K yields of Guinea grass were significantly different between sources of N fertilizer. The average values were 60.60 gm/pot, 556.75, 3,479.08, 97.22 and 639.18 mg/pot respectively when ammonium sulfate was applied and were higher when compared with the urea source (51.52 gm/pot, 369.67, 2,311.25, 87.15 and 448.73 mg/pot, respectively). Recovery of nitrogen fertilizer was found to be between 18-26 percent and the highest recovery of Guinea grass was 26 percent from ammonium sulfate N source and the lowest, 18 percent from urea N source and nitrogen recovery increased with increasing labelled of nitrogen fertilizer. The balance sheet of nitrogen average in two N source and average in three N rate were found in stem 23 percent, root 4 percent, soil residual 31 percent and loss 42 percent.
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