ISHS Acta Horticulturae 448: III International Symposium on Mineral Nutrition of Deciduous Fruit Trees
EFFECT OF POTASSIUM AND MAGNESIUM FERTILISATION ON YIELD AND NUTRITIONAL STATUS OF CONFERENCE PEAR TREES |
| Authors: | A. Aizpurua, M. Domingo, G. Besga, R. Amenabar |
| Keywords: | soil analysis, leaf analysis, fruit analysis, mineral nutrition, per, potassium, magnesium |
| Abstract:
A fertilizer factorial trial Mg*K was started in winter 1995 in a six-year-old orchard with three Mg treatments (20, 60 and 100 kg/ha) and four K treatments (70, 140, 210 and 280 kg/ha) with three replications. Also a control treatment (without K and Mg) was included in the assay. Potassium dressing raised soil K content but effect of Mg application on soil exchangeable Mg was not so clear except for the highest Mg dose. Yield of fertilized plots was 5.7 t/ha higher than of control but there were not significant differences. Leaf Mg concentration was not affected by Mg application and leaf K concentration in control plots was lower than in K fertilized plots. K and Mg dressings did not affect fruit nutrient concentrations. Leaf nutrients showed some significant correlations between them, for example, Ca and Mg were positively correlated, and K had a negative effect on both. Also there were nutrient relationships between soil and leaf nutrients, so Mg and Ca in soil had positive effects on Mg and Ca in leaves, respectively. All the macronutrient concentrations were significantly related between them in the fruits. Firmness of the fruits was negatively correlated with N, P and Mn contents of the leaves, and the refractrometric index with Ca concentration in leaves and with yield. Finally, fruit production was positively related to leaf N, P and Ca concentrations. | |
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