[Effect of seed rate, interrow width and nitrogen fertilization on oil radish grown for seed]
2000
Nedzinskas, A. | Nedzinskiene, T. (Lithuanian Inst. of Agriculture, Dotnuva (Lithuania))
Over the period 1994-1997 investigations of oil radish cultivation for seed were carried out at the Lithuanian Institute of Agriculture's Voke Branch on a sandy loam soil lying on coarse sand and gravel. Oil radish was sown at 12.5 and 25 cm interrow widths at seed rates of 10, 15, 20, 25 and 30 kg/ha and fertilised with N 60 P 60 K 60. In the N fertilisation experiment oil radish was fertilised with P 60 K 60 and N 0, N 30, N 60, N 90 and N 120. It was determined that the seed yield of oil radish was to a great extent dependent on weather conditions. In 1995, which was the most favourable year, oil radish sown at a seed rate of 20 kg/ha gave one ton of clean seed, while in the droughty year of 1994 the same seed rate gave a seed yield of 0.63 t/ha. The best interrrow width was proved to be 12.5 cm. Average experimental findings show that when oil radish was sown at a seed rate of 20 kg/ha, at an interrow width of 12.5 cm the seed yield was 0.81 t/ha, while at an interrow width of 25 cm the seed yield was 13.6 lower. When sowing oil radish at 12.5 and 25 cm interrow widths the best seed rate was 15-20 kg/ha. Higher seed rates resulted in a lower branching of plants and a lower number of pods. When fertilising with phosfhoric and potash fertilisers the most suitable rate of nitrogen was N 90. Having increased the rate up to N 120 the seed yield of oil radish tended to go down, the vegetative growth period lengthened by 4-8 days and the crop was more affected by lodging
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