Influence of phasal fertilization on the soil fertility, nutritive balance and production, at a crop of cucumbers produced in vegetation pots

Abstract

A primary factor in achieving higher production to crops, along with other vegetation factors, is the fertilization. For the vegetable crops where production system is intensive, it is frequently used the additional fertilization, using solid or liquid fertilizers as radicular or foliar application. The supplementary fertilizations made in the period of intensive growth and on the background of a basic fertilization judiciously set, createin soil the stabilization of the nutritive balance, resulting in increased production. In this context, at the culture of cucumbers under study, on an plotof 250 Kg / ha active substance NPK, the use of F221foliar and of the urea administered to the soil, in 2 successive pheno-phases led to a content of the accessible forms of nutrients of 47 ppm nitrate ammonia nitrogen and, 45 ppm accessible phosphorus and 204 ppm accessible potassium in the soil. These insurance levels in the soil correlate with content of total forms of nutrients from the plant in the bloom phenol-phase, 5.1, 0.45 and 5.1% nitrogen, total phosphorus and potassium. The productions obtained with the same formula fertilization is situated at 51000 kg / ha, statistically assured. The comparative results are obtained by using F221and ammonium nitrate in the same pheno-phases, respectively crops of 49800 kg / ha, but with slightly lower production increases.