Integrated Effect of Organic Sources and Inorganic Nitrogen Levels on Transplanted Rice (oryza Sativa L)
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Date
1996
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Birsa Agricultural University, Ranchi
Abstract
A field investigation was carried out to study the integrated effect of organic sources and inorganic nitrogen levels on transplanted rice (IR-36) under wet land condition during the kharif season of 1994 at BAU Farm, Ranchi. The experiment was laid out in Randomized Block Design with three replications. Each replication consisted of nine treatments. Combination of 3 levels of nitrogen (0, 50 and 100 kg ha-¹) and three sources of organic nitrogen (FYM @ 5t ha-¹, BGA @ 10kg ha-¹ and karanj cake @ 600kg ha-¹). The treatment combination was T₁ - 0 kg N ha-¹ 5 t FYM ha-¹, 7₂-50 kg N ha-¹ + St FYN ha-¹, T3-100 kg N ha-¹ + 5 t FYN ha-¹, T₁-0 kg N ha-¹. -1 10 kg BGA ha ¹. T-50 kg N ha-¹ +10 kg BGA ha-¹, T-100 kg N 1+ 10 kg BGA ha-¹, T₂-0 kg N ha-¹ 600 kg karanj cake ha-¹, Tg- 50 kg N ha-¹ + 600 kg karanj cake ha-¹, T- 100 kg N ha-¹ 600 kg karanj cake ha¹. 50 kg P₂05 and 50 kg K₂0 per hectare were applied as basal dose. N, P and K were applied form of Urea, SSP and MOP. The soil of the experimental site was loamy in texture, low to medium in fertility status and slightly acidic in reaction (pH- 6.2).
It is evident from the data that inorganic nitrogen levels influenced significantly the height of rice plant, number of leaves per hill, number of effective tillers par hill, dry matter par hill, length of panicle, number of grains per panicle and thousand grain weights. Effect of different organic sources of nitrogen was statistically at par.
A close perusal of the experimental finding clearly indicated that when 100 kg N ha-¹ was applied in soil, it recorded the maximum grain yield. But maximum not profit was obtained when 100 kg N ha-¹ + 10 kg BGA ha-¹ was applied in soil (Rs.5190.33 not return ha-¹) followed by treatment receiving 100 kg N ha-¹ + 5 t FYM ha-¹ (Rs.5011.22 ha-¹ not return). The benefit : cost ratio was maximum (1.74) when 100 kg N ha-¹ + 10 kg BGA ha-¹ was applied followed by treatment receiving 100 kg N ha-¹ + 5 t FYM ha-¹ (1.66).
Nutrient status of soil after harvesting of crops 1.e organic carbon, available N and P content of soil was found to increase in different treatment from initial value whereas K contents of soil slightly decreased from initial value. Moreover, all these results are of a single year and hence, for the confirmation of result, the investigation needs to be repeated.