Effect of nitrogen and water stress on the growth, water use efficiency and seed yield of rapeseed (Brassica napus L.)
1995
Wamuongo, J.W.
The effects of water stress and nitrogen application to the growth, yield and water use efficiency of rapeseed were investigated in the greenhouse. The parameters measured included plant height, maximum number of leaves on the main stem, number of primary branches per plant among others. All parameters, except for maximum number of leaves on the main stem were affected by water stress. Application of N fertilizer when water supply was adequate promoted growth of all plant parts and increased yield, while application to water stressed plants suppressed growth and yield. When N was not applied, there was a more conservative use of available water, leading to less dry matter product than when water was not limiting. The water-stressed, non-fertilised plants were the most inefficient in water use, requiring about 3300g of water to produce 1 g dry matter while the non-stressed plants regardless of the N fertilizer applied, were about twice as efficient requiring about 1000 of water to produce 1 g dry matter. However, these values are still large compared to those obtained under field conditions.
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