Efficiency of oil radish growing in crop rotation
2005
Vucans, R., Latvia Univ. of Agriculture, Jelgava (Latvia) | Livmanis, J., Latvia Univ. of Agriculture, Jelgava (Latvia)
The purpose of our experiment with oil radish were to clarify the effect of applied nitrogen (N) and phosphorus (P) fertilizer norms on dry matter (DM) yield and chemical composition of oil radish green mass, as well as green manure effect on the changes of plant nutrients in soil. The field experiments (2000-2004) were carried out on heavy loam pseudo-gley soil (GLx) on the crop rotation long-term field experimental plots of the Department of Soil Science and Agrochemistry in the Study and Research farm "Peterlauki". The 5-year average results showed fluctuations in DM yields being 4.3-5.2 t haE-1 depending on N-fertilizer and P-fertilizer norms. Nitrogen content in oil radish DM yields was mainly influenced by the N-fertilizer, but the fertilizer P effect was observed only in particular years. The tendency of calcium and magnesium medium high increase was observed with the increase of the fertilizer norms, but potassium (K) content increased at the lowest N-fertilizer norm N30 when the P-fertilizer norms were increased. Climatic conditions were one of the most significant factors when growing oil radish as green manure crop. Highest yields of green cut material and DM yields were provided with the fertilizer norm N90P26K50. Increased P-fertilizer rates had no significant effect on the oil radish yield, however insignificant yield increase was observed. Incorporation of great oil radish mass in soil resulted in the increase of N, K and Ca mass in soil. Green manure both contributed to organic mass in soil and eliminated the risk of leaching out plant nutrients from soil.
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