THE STORAGE OF CABBAGE AND CARROTS FOR SEED PRODUCTION
The productivity and quality of seeds of biennial vegetable crops depend both on the growing conditions of the crop in the first season, and on the storage methods. The application of mineral fertilizers is of great importance to increase the yield of plants for seed production. However, it is necessary to know in each particular case the optimum amounts of fertilizers which ensures high yields of plants for seed production, good keeping quality and a high seed yield.
There are a great number of works which show how yield, chemical composition and keeping quality vary with growing conditions and the fertilizers applied. At the same time little is still known about how fertilizers affect the storage duration and productivity of biennial vegetable crop plants for seed production. The keeping quality and seed productivity of plants for seed production depend also on the storage methods. But this question too is unsufficiently studied.
The aim of the investigations which have been carried out in our institute has been to study the effect of certain agrotechnical methods in the growing of cabbage and root vegetables for seed production and storage methods on yield, keeping quality and seed productivity.
Experiments to study the effect of mineral fertilizers on yield of heads, keeping quality and seed productivity of cabbage were carried out on floodplain soils of the river Lesnoj Voronezh in the teaching and research farm "Rošca" of the I.V. Michurin institute of fruit and vegetables.
The floodplain soils of the river Lesnoj Voronezh are gray and light gray solods, of clayey mechanical composition, and a low humus content. The soils are from medium to low in hydrolyzable nitrogen, medium in available phosphorus, and low in exchangable potassium.
The plains are flooded during the spring flood of the river, therefore the fertilizers were applied in early spring before deep cultivation. A second cultivation was carried out before the cabbage was transplanted in the beginning of June.
The fertilizers used in the experiments were ammonium nitrate (34% N), superphosphate (18% P2O5) and potassium chloride (60% K2O).
The effect of fertilizers was studied on the medium late variety Slava 1305, which is of medium keeping quality, and the effect of storage conditions on the variety Amager 611 which is late and keeps well. The experiments were carried out in the period 1965–1968. The effect of fertilizers