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Journal of the Indian Society of Soil Science
Year : 2004, Volume : 52, Issue : 3
First page : ( 238) Last page : ( 242)
Print ISSN : 0019-638X.

Effect of long-term manuring on soil organic carbon, bulk density and water retention characteristics under soybean-wheat cropping sequence in North-Western Himalayas

Bhattacharyya Ranjan*, Prakash Ved, Kundu S., Srivastva A.K., Gupta H.S.

Vivekananda Parvatiya Krishi Anusandhan Sansthan (Indian Council of Agricultural Research), Almora, Uttaranchal, 263601

*Corresponding author (E-mail: ranjan_vpkas@yahoo.com)

Received:  March,  2003; Accepted:  September,  2004.

Abstract

The dynamics of soil characteristics was studied in an on going long term fertility experiment since kharif 1973 at Hawalbagh, Uttaranchal with 6 treatments (viz. NP, NK, NPK, N+FYM, NPK+FYM and Control) comprised of recommended levels of N, P, K and FYM @ 10 Mg ha−1. The manure and fertilizers were given in soybean crop every year and wheat crop was grown on residual fertility. Depthwise (0–15, 15–30 and 30–45 cm) soil samples and undisturbed soil cores from all the treatments were studied for oxidizable and non-oxidizable organic carbon (OC), bulk density (BD), soil-water retention and available water capacity. Both oxidizable and non-oxidizable soil OC contents of the soil were higher in FYM treated plots at the first two depths (1.31 and 10.44 g C kg−1 in 0–15 cm; 1.87 and 8.44 g C kg−1 in 15–30 cm, respectively for NPK+FYM treatment) and were significantly higher than all other treatments. The BD was minimum in NPK+FYM treatment in all the depths (1.24, 1.24 and 1.25 Mg m−3, respectively) and it had a negative correlation with OC content. It has also been found that decrease in BD per unit increase in non-oxidizable OC content over initial soil was more than decrease in BD per unit increase in oxidizable OC content. Water retention on volumetric basis decreases with increasing depth and suction within a particular treatment, the highest water retention was found in FYM combined treatments. Available water capacity was maximum in N+FYM and NPK+FYM treatments and showed a decreasing trend with depth. The N+FYM treatment has a net gain of 2.85 cm (per 45 cm soil layer) of available water over control in 29 years while NPK+FYM treatment has the gain of 3.45 cm.

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Key words

Soil-water retention, organic carbon, FYM, bulk density, north-western Himalayas.

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