Effect of fertilizer and water deficiency stress on nitrogen in the root mass yield of lucerne for seeds
2008
Vasileva, V., Institute of Forage Crops, Pleven (Bulgaria)
A pot trial was carried out to determine the effect of fertilizer and water deficiency stress on nitrogen in the root mass yield of lucerne for seeds. Ammonium nitrate and well matured cattle manure, as a source of mineral and organic nitrogen, were used. The plants were grown under optimum moistening conditions (75-80 per cent of field capacity) and water deficiency stress (37-40 per cent of field capacity). Under optimum moisture conditions the use of mineral fertilizer at a dose of 210 and 70 mg N per kg soil increased nitrogen in the root mass yield by 9 and 21 per cent, and the manure applied at the same doses by 36 and 43 per cent. Under water deficiency stress conditions the use of mineral fertilizer decreased nitrogen in the root mass yield by 8 and 12 per cent, and the manure application increased it by 24 and 28 per cent. As a whole, water deficiency stress decreased nitrogen in the root mass yield by 26 and 35 per cent under mineral fertilizer, and by 20-21 per cent under manure application. Plants treated with manure are less susceptible to the stress conditions of water deficiency
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