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G. N. Gupta , Premlal , A. K. Mishra , G. R. Kachhawaha

Abstract

A field experiment was conducted in Indira Gandhi Nahar Project area of the Indian desert to find out optimum schedule and suitable method of irrigation for raising irrigated plantations of Dalbergia sissoo. Various treatments were comprised of three methods (Flooding, Spot and Furrow), three frequencies (20-40-60 days for winter, 10 -20-30 days for monsoon and 7 - 15 and 22 days interval for summer months) and three quantities (30,45 and 60 mm) of irrigation. Observations on growth and biomass of 14 months old plantation indicate that spot method of irrigation produced the best initial growth of plantation with 45 mm of water added at the interval of 10 days in summer, 20 days in monsoon and 30 days in winter mouths. This treatment resulted in trees of 162 cm average height producing total biomass of 27.4 q/ha for 14 month old plantation of Dalbergia sissoo. The water use efficiency due to this treatment was 12.2 kg/mm which was maximum as compared to all other treatments.

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G. N. Gupta , Premlal , N. Singh , B. Singh , N. K. Bohra

Abstract

A field experiment was conducted to investigate the effect of varying levels of nitrogen (0, 9 and 18g N per plant) and phosphorus(0, 3 and 6 g P₂O₅, per plant) in factorial combinations, on the growth of Ailanthus excelsa planted on an arid sandy soil in Rajasthan. Nitrogen application at the rate of 9g N per plant improved the plant height by 24 per cent when recorded after one year of plantation. Phosphorus application at the rate of 6 g P₂O₅ per plant improved the ischolar_main length by 27 per cent and ischolar_main spread five folds after one year of plantation. Preplant application of 9g N combined with 6g P₂O₅, per plant was the best treatment which improved the height of two year old trees from 144 to 213 cm.

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