The Crop Rotation and the Irrigation Influence on Soil Fertility Parameters and on the Wheat Yield in the Crisurilor Plain Condition
Natural Resources and Sustainable Development, 2012
8 Pages Posted: 9 Dec 2015
Date Written: December 7, 2015
The paper is based on the researches carried out in a long term trial placed in 1990 on the preluvosoil from Agricultural Research and Development Station Oradea. In comparison with unirrigated and irrigated wheat-monocrop, in wheat-maize crop rotation, structure degree increased with 10% and 13% and in the wheat-maize-soybean with 23% and 24%. In comparison with the bulk density registered in the wheat monocrop in the wheat-maize crop rotation the average value on the 0-20 cm depth decreased with 2.1% in unirrigated variant and with 1.3% in the irrigated variant; the differences registered in the wheat-maize-soybean were of 5.6% and 3.4%. As consequence, the values of the total porosity increased in comparison with the values registered in wheat monocrop; the values of the air porosity increased, too. Penetration rezistance had the smallest values in wheat-monocrop: 17.3 kgf/cm2 and 19.5 kgf/cm2; in wheat-maize crop rotation, the values of the penetration decreased and in the wheat-maize-soybean crop rotation were registered the smallest values. In these conditions, in comparison with the wheat monocrop variant, in the wheat-maize crop rotation, the values of the hydraulic conductivity increased with 16.3% in unirrigated conditions and with 20.2% in irrigated variat; in the wheat-maize-soybean crop rotation, the differences were bigger: 33.9% and 51.8%. All the years studied, the smallest values of the wheat yield were registered in the wheat-monocrop; the yield increased in the wheat-maize crop rotation and the biggest yields were registered in the with-maize-soybean crop rotation. The irrigation determined the yield gains very significant statistically every year studied.
Keywords: wheat, maize, soybean, crop rotation, irrigation, yield gains
JEL Classification: A10
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