Researches regarding the development of some soil tillage and sowing methods for the maize crop
1986
Similaru, E. (Statiunea de cercetari agricole, Simnic (Romania))
The research has been carried out within the Laboratory of non-irrigated agrotechnique at the Station of Agricultural Research Simnic, in the period 1981-1984, in a crop rotation of 3 years: sunflower - wheat - maize. The variants studied were fertilized with 100 kg N + 80 kg P2O5/ha. The soil on which the trials were located is reddish-brown, poorly leached, with a humus content of 1.9-2% and a pH of 5.8-6.0. The grain yield in the non-ploughed variants is in 4 years on average of 37.0-39.1 q/ha, and in the variants disked twice after the preceding crops, the yield increase is of 4.9-5.7 q1690/ha, being distinctly significant. In the ploughed variant an additional yield of 11.9-15.2 q/ha and a very significant increase was obtained as compared to the yield of the non-ploughed check. From the energetic point of view the maize crop is efficient both in the ploughed and in the disked and non-ploughed variants. The optimum sowing time for the experimented hybrids was between the 15th-30th April, when maize emerges in 10-12 days and records yield increases of 8% as compared to the sowing times from the 1st of April to the 15th of May. The optimum sowing density for the semi-late and late hybrids studied was 50-60 thousand plant
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