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THE USE OF PLANT ANALYSIS IN STUDIES OF THE NUTRITION SYSTEM OF VEGETABLE PLANTS GROWN FOR SEED PRODUCTION
The most important of them are plant requirements in nutrient elements necessary to receive planed yields, dynamics of assimilation of nutrient elements in plants, amounts of available nutrient elements in soil, and local climatic conditions.
Adequate nutrition for seed bearing plants is of a paramount importance because it provides not only for high yields of seeds but particularly for the improvement of seed quality which is very important for obtaining high crop yields.
The analysis of onion seed bearing plants may serve as an example of elaborating a system of fertilizer application.
Figure 1 shows sequence in formation of various organs in onion seed plant (grade Zittaus) grown on podsolized loam soil (Gribov, Plant Selection Station). In early June the planted bulbs already formed some tops; in the middle of June there appeared floriferous shoots and in the middle of July formation of flower cluster was nearly completed.
As the bulb was growing and its various organs developing, amounts of nutrient elements assimilated by the plant, as well as their ratios, were changing.
Nitrogen initialy was found to accumulate in tops, later on it moved to floriferous shoots and finally to seeds (Fig. 2).
Phosphorus was distributed nearly in the similar way (Fig.3) except that smaller amounts of it got into seeds.
Initially, comparatively large amounts of potassium accumulated in tops