The effect of the fertilisation and vegetation period on grass-production, nitrogen- and mineral content
1997
Banszki, T. (Debreceni Agrartud. Egyet., Debrecen (Hungary). Mezogazdasagtud. Kar)
The effects of NPK fertilisation on the seasonal fluctuation of grass-growth yield and nutrient content during a four year experiment were investigated. The yield ratio of control plot of 1st, 2nd and 3rd grass growth were 58-24-18 percent, on the fertilised plots the ratio of yield of 1st grass growth was 53-61 percent, 2nd was 22-28 percent and the 3rd was 17-19 percent. The yield fluctuation between the treatments was the lowest in the 1st grass-growth on the fertilised plots. The nutrient content and the ratio of elements changed seasonally. For example the N content were 1,7-2,7 percent of the 1st growth, 2,0-2,8 percent of the 2nd growth, 2,3-3,25 of the 3rd growth. The range of the relative deviation of the specific nutrient content was higher than 50 percent in the case of Ca, Mg, Zn, Cu in between the different growth (the highest deviation was in the 3rd growth), under the influence of fertilisation the seasonal fluctuation was relatively higher in the case of N, Cu, Zn elements (most of the cases the highest in the 1st growth). As a consequence of fertilisation the ratio of elements developed a different proportion. The N/P, N/K and N/Ca ratio were modified to the highest degree (100 percent plus/minus - interval). In the case of feeding the seasonal fluctuation of grass yield distribution has to be taken into consideration
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