Vol. 73 No: 3

Title:
Effects of Nitrogen and Potassium Fertilization on the Growth, Yield and Pitburn of Apricot (cv. Bergeron)

Authors:
C. BUSSI and M.J. AMIOT

pp: 387-392

Abstract:
Nitrogen (N) and potassium (K) fertilization were studied in apricot trees. Increasing N enhanced vegetative growth, yield and average fruit weight, but reduced fruit colouring. More effect was seen by increasing N from 0 to 25 kg ha^-1 than by increasing from 25 to 150 kg ha^-1. K fertilization did not affect vegetative growth or yield but tended to stimulate fruit colouring and enhance soluble solids concentration of fruits. N and K interacted to affect vegetative growth and pitburn. Pitburn increased significantly as N was increased from 25 to 150 kg ha^-1. Concurrently, fruit N content increased and Ca content decreased suggesting that these nutrient concentrations are related to pitburn incidence. Of the levels of N studied, 25 kg ha^-1 was the most commercially suitable, since yields were only slightly less than at 150 kg ha^-1 but pitburn was significantly lower.

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