Articles
THE EFFECT OF CHEMICAL FERTILIZERS ON GROWTH, FRUITING AND PREMATURE DECLINE OF APRICOT UNDER NORTH-WESTERN CONDITIONS OF ROMANIA
The numerous studies that have been done to find the best technological processes have also included aspects of fertilization and difficulties caused by its premature decline.
The studies carried out by Borderianu and others (1968) Botez, Niculina Burloi (1977), Marinov (1981) have proved that the apricot responds very well to all kinds of fertilizers.
As for the nutritive element consumption it includes 90 kg N, 30 kg P and 85 kg K (Botez and Burloi, 1977).
With reference to the leaf diagnosis, Levi considers the optimal quantity of N in leaves to be 2.75%, of P, 0.24% and of K, 2.25%. With respect to the link between N in the leaves and yield, Marinov found the best results with higher quantities of N (3.30–3.50%).
An experiment was set up to ascertain now premature decline occurs depending on the NPK doses.
The plantation was established in 1975 on a brown soil of clay-loam texture which contains 40.2% clay with the extremity between 36.5%, 42.5% and 2.11% humus on a profile of 0–40 cm.
The rainfall conditions – the average during the period of research was 617.4 mm, the minimum being 470.7 and the maximum 799.7 mm.
The average temperature from 1975 to 1984 was 10.1°C and the minimum was minus 21.6°C.