An Asian Journal of Soil Science

Mohan Chavan ¹, B. T. Pujari ¹, Ashok Surwenshi ¹, B. R. Jalageri ¹

Affiliations
1 Krishi Vigyan Kendra, (U.A.S.), Raichur (Karnataka), IN

Abstract

In an experiment conducted at the Agricultural College Farm, Raichur on deep black clay soil during late Kharif season of 2002-03 on sustaining castor productivity by relative use of green manure and nitrogen levels. The results showed that, green leaf manuring of sunnhemp recorded significantly higher seed yield (10.23 q ha^-1), seed weight per plant (62.78 g), number of spikes per plant (8.46), dry matter accumulation in reproductive parts (40.70 g plant^-1), dry matter accumulation in stem (87.19 g Plant^-1) and leaf area (85.82 dm^-2 plant^-1) over the sole castor without green manuring and castor with in situ green manuring. Among the nitrogen levels, application of 80 kg N ha^-1 produced significantly higher seed yield (10.09 q ha^-1), seed weight per plant (59.20 g), number of spikes per plant (7.93), dry matter accumulation in reproductive parts (38.82 g plant^-1), dry matter accumulation in stem (83.91 g plant^-1) and leaf area (90.58 dm^-2 plant^-1) over the control, application of 20 kg N ha^-1 and 40 kg N ha^-1. However, it remained at par with the application of 60 kg N ha–1 (10.07 q ha^-1, 58.57 g plant^-1, 7.73, 38.51 g plant^-1, 83.57 g plant^-1 and 90.26 dm^-2 plant^-1 of seed yield, seed weight per plant, number of spikes per plant, dry matter accumulation in reproductive parts, dry mater accumulation in stem and leaf area, respectively).

Keywords

Castar, Green Manure, Nitrogen.

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Mohan Chavan ¹, B. T. Pujari ¹, Ashok Surwenshi ¹, B. R. Jalageri ¹

Affiliations
1 Krishi Vigyan Kendra, Raichur (Karnataka), IN

Abstract

A Study on influence of green manure and nitrogen levels (0, 20, 40, 60 and 80 kg N ha^-1) on nitrogen uptake and available nitrogen content in soil was undertaken at the Agricultural College Farm, Raichur on deep black clay soil during late Kharif season of 2002-03. The result showed that, incorporation of green leaf manure to castor recorded significantly higher nitrogen uptake (72.35 kg ha^-1) over the sole castor without green manuring and castor with in situ green manuring. The available nitrogen content in the soil after harvest of castor was significantly higher in the in situ green manuring treatment (274.30 kg ha^-1) over the sole castor (204.01 kg ha^-1) and castor with green leaf manuring (237.94 kg ha^-1). Among the nitrogen levels, application of 80 kg N ha^-1 recorded significantly higher nitrogen uptake (77.66 kg ha^-1) and available nitrogen content in soil (262.28 kg ha^-1) after harvest of the castor, while N uptake by castor with the application of 60 kg N ha^-1 (74.45 kg ha^-1) was found at par with that of 80 kg N ha^-1.

Keywords

Nitrogen Uptake, Nitrogen Content, Green Manure.

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