University of Khartoum

Long and Short-Term Effects of Conventional Tillage on a Vertisol Properties Under Sugar Cane Plantation

Long and Short-Term Effects of Conventional Tillage on a Vertisol Properties Under Sugar Cane Plantation

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Title: Long and Short-Term Effects of Conventional Tillage on a Vertisol Properties Under Sugar Cane Plantation
Author: Abdalla, Mubarak Abdelrahman
Abstract: The effects of a long (LT) (> 40 years) and short-term (ST) (< 10 years) of conventional tillage on some soil properties in a sugar cane grown in a vertisol were compared to native vegetation (NV)in a semi-arid tropics of Sudan. The tillage sequence was sub-soiling, smoothing by disc harrowing, levelling and ridging (these are every 4 — 5 years) and re-ridging annually. The study showed that weight of particulate of organic matter associated with sand particles (POM) in the LT (9.6 g kg') and ST (6.7 g kg') were significantly (13 0.007) higher than that reported in NV (2.1 g kg'). In the 0 - 10 cm soil depth, tillage had no effect on total nitrogen (TN), organic carbon (OC) and bulk density (Bd). However, in the 10 — 20 cm soil depth, significantly (P 0.03) more N was incorporated in the LT tillage (0.46 g kg'') compared to NV and ST tillage (0.26 — 0.33 g kg'). In this depth (10 — 20 cm), LT tillage significantly (P 5 0.01) decreased Bd from 1.8 (in ST) and 1.7 (in NV) to 1.5 g cm-3. In the third depth (20 —30cm), TN and Bd were not affected while OC was significantly (P 0.009) decreased from 4.9 g kg' (in NV) to 2, g kg' (in LT) and 1.7 g kg"' (in ST). In the lower soil depth (30 — 40 cm), there was more incorporation of OC (though not significant) in the LT compared to ST and NV. More C and N were incorporated into the lower soil depth (particularly in the 10 — 20 cm depth) in LT. It could be concluded that, in heavy textured soils (> 52% clay) under cane production in the dry tropics, soil degradation by tillage might not be a constraint if non-inverted tillage is used.
URI: http://khartoumspace.uofk.edu/123456789/22238


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