Economical and ecological acceptance of field crops production in view of nitrogen fertilisation and location
2002
Tajnsek, A. | Santavec, I. | Ceh-Breznik, B. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Agronomy Dept.)
In long term static experiments (Central Slovenia, NE Slovenia, W Hungary) the interaction between four different intensities of mineral nitrogen fertilisation (0 kg ha-1, 73 kg ha-1, 147 kg ha-1, 220 kg ha-1) and two different ways of organic fertilisation (straw, maize straw ploughing in and green manure; animal manure ploughing in every third year) were examined. The results showed that the income per hectare cannot be a good indicator of the economical effect of mineral and organic fertilisers. The calculation of direct income from fertilisation with nitrogen (DIN) per hectare gives more precise informations. In the situation when the prices of agricultural produces become lower and lower and material expenses raise the great importance is attached to the aimed fertilisation for higher DIN. In the study the difference between the DIN at the maximal yield and the maximal direct income (mDIN) was 1.467-20.315 SIT ha-1, the difference between mineral nitrogen rates at maximal yield and nitrogen rate at mDIN was 9-262 kg ha-1. The farmyard manure mineralization is quicker at Rakican and Keszthely than at Jable. The reachable maximal yield of arable crops in the rotation at Jable is higher in the straw system but at Rakican and Keszthely better results are achieved in the manure system. The maximal DIN was got in N2 fertilising rate at both systems (147 kg N ha-1 of mineral N and 50 kg N ha-1 from manure in the manure system and 93 kg mineral N ha-1 in the straw system). The criteria of sustainable managing and satisfactory DIN correspond to the N1 mineral fertilisation intensity in both systems at Rakican and Jable; namely, 73 kg ha-1 of mineral N and 50 kg N ha-1 from manure in the manure system and 93 kg mineral N ha-1 in the straw system.
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