[Minimisation of primary soil tillage in crop rotation.] Agrochemical properties of soil
Krogere, R.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management) | Liepins, J.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management)E-mail:[email protected]
Changes in agrochemical properties of soil in a long-term, stationary primary soil tillage experiment have been studied. A six-field crop rotation was used: 1-2 - perennial grasses (red clover + timothy), 3 - winter wheat, 4 - oat, 5 - barley, 6 - barley with under sown grasses. Three systems of tillage were compared in a six-field crop rotation: 1st - ploughing at 0.22-0.24 m every year (control); 2nd - ploughing at 0.22-0.24 m once in the crop rotation (after perennial grasses), and shallow (0.10-0.12 m) ploughing for three successive years (after winter wheat, oat and barley); 3rd - the same as the second variant (except that deep ploughing was used before spring barley with under sown perennial grasses). It was established that content of organic matter was independent of soil primary tillage. A slightly reduced organic matter content (19.1 g kgE-1 in comparison with 19.8 g kgE-1 for control) was noted only in the 3rd variant after a 14-year treatment. The content of plant available phosphorus and potassium was equal in all the variants. Conclusion is drawn that shallow ploughing did not affect the soil agrochemical properties in succession of three years. The second tillage system is considered as more advantageous - residues of perennial grasses are incorporated into lower layer of soil and remain there for five years.
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