Stabilizing factors of grain yield in malting barley
1983
Malesevic, M. (Poljoprivredni fakultet, Novi Sad (Yugoslavia). Institut za ratarstvo i povratarstvo)
The optimum agrotechnical measures for the production of NS-294 variety of spring brewer s barley (in chernozem, with maize as a forecrop) was investigated. The influence of crop density (CD) on the number of ears was notable. The number of ears increased with higher CD all years of the investigation. The highest yields were achieved with about 650 ears per sq m. The productive tillering coefficient was about 2. The influence of sowing density (SD) and the nitrogen quantity on the yield of grain was almost equal. The interaction of the 2 fctors was obvious: with increased SD the nitrogen quantity must decrease. On a many-year average, the yield increased notably even up to 80 kg N, regardless of the SD. Observingthe yield by years, regardles of the SD, it was noticed that the yield increased up to 40 kg in the first 3 years and in 1980 up to 80, i.e. 60 kg N, although approximately the same N quantity was put under the forecrop each year. In the years when the vegetation stage was shorter, higher densities (450grains) were favoruable and in the years with more humid and cooled springs lower densities (250-350 grains per sq m) were sufficient. The influence of N on the yield, with optimum SD (350 and 450 grains per sq m) was completely the same to that when extreme SD were included, but the yield level was much higher. The next important factor is sowing time. Sowing after March led to notable decrease of the yield. The hectolitre weight was practically unchanged unde the influence of N. The mass of 1,00 grains decreased under the influence of density. The protein content was the lowest with the application of 40 kg N/ha.
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