Effect of a period of drought and soil acidity on the seed yield of winter rape in relation to nitrogen rates

Barszczak, Z.; Barszczak, T.; Gorczynski, J.

Postepy Nauk Rolniczych 40/45(6): 15-23

1993


Accession: 002599838

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Abstract
In a trial in 1991-92, rape cv. Mar, Panter, Bolko, Ceres and Liporta were grown in pots with an area of 0.126 msuperscript 2 filled with a reconstructed soil profile and sunk in a field. Soil pH in the surface layer was 6.4, 4.9 or 4.1 and the plants were given 140 or 280 kg N/ha in spring. Half the pots were covered with polythene tunnels from the start of budding to the end of flowering to exclude rainfall; these pots received 135 mm less rainfall than the controls. Seed yields ranged from 39.9 g/pot in Bolko to 47.0 g in Mar and averaged 47.3 and 39.3 g without and with water stress, 43.2, 45.77 and 40.9 g at the 3 soil pH levels and 35.8 and 50.8 g at the 2 N rates, respectively. The differences due to soil pH increased with a period of water stress and at the higher N rate. Drought decreased the efficiency of fertilizer N. The number of lateral branches and 1000-seed weight varied significantly between cultivars, was reduced by water stress and increased at the higher N rate. Cv. Bolko had the lowest seed oil content and the highest protein content; Mar had the highest oil content.