Effects of Wheat straw on Wheat seedling growth, Development and Nutrient content.
2002
Asefa Taa;Tanner,D. and Bennie,A.T.P.(Researchers)
A pot experiment was conducted in a lath house at the Kulumsa research station in Ethiopia using soil and wheat straw collected from research fields at the Kulumsa and Asasa stations. The experiment comprised 13 treatments, consisting of a control (i.e., no straw added) plus the full factorial combination of three levels of straw management (i.e, burning incorporation and surface retention), two types of straw (i.e., naturally degraded and fresh straw), and two rates of straw application (i.e., 0.8 and 2.5 t ha-1). The trial was replicated over time in three separate runs during 1999 and 2000. In general, straw application exhibited a negative effect upon most of the measured seedling parameters, and in some cases this may have been due to an allelopathic effect. Burning of the straw at least partially alleviated the negative effects of straw application. Conversely, soil incorporation of straw resulted in pronounced reductions in most of the measured seedling parameters. Similarly, the highest rate of straw application consistently reduced seedling parameters, while the application of fresh straw tended to reduce the measured parameters more than naturally degraded straw. The deleterious effects of the high rate of straw application were consistently exacerbated by soil incorporation, while straw burning _ and occasionally surface retention _ tended to negate the effects of the highest rate of straw application.
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