ISHS Acta Horticulturae 729: III Balkan Symposium on Vegetables and Potatoes
LEAF NUTRIENT LEVELS OF SNAP BEANS (PHASEOLUS VULGARIS L.) IN RELATION TO CROP YIELD IN CENTRAL MACEDONIA (NORTHERN GREECE) |
| Authors: | D. Almaliotis, S. Bladenopoulou, CH. Chatzissavvidis, I. Boujioukli |
| Keywords: | vegetables, nutrition, fertilization, minerals, nitrogen, multiple regressions |
| Abstract:
Eighteen fields of alkaline pH (7.26-8.12) were cultivated with snap beans (cv. ‘Baroma’) during the period mid-spring – mid-summer of 2002 and 2003 in central Macedonia (northern Greece). They were harvested mechanically, weighed separately for each field and processed as frozen product. Nitrogen was applied at a rate of 75 to 150 kg/ha and additional nutrients were applied as required by soil analysis. Leaf sampling was carried out at the beginning of flowering and the nutrients were determined. Yield ranged from 5.51 to 14.93 t/ha, with a standard deviation of 2.68 t/ha and a mean yield 8.48 t/ha. Multiple regression analysis revealed that yield was closely related to contents of leaf nutrients (r2=0.943). Leaf nutrient ranges were: a) Macronutrients (%): N 3.89-4.78, P 0.15-0.29, K 1.70-3.10, Ca 2.26-3.15, Mg 0.43-1.08 and b) micronutrients (mg/kg): B 14.2-36.3, Mn 31.5-138.5, Zn 19.0-31.0, Fe 103.5-579.0 and Cu 8.0-24.5. Furthermore, a stepwise variable selection program showed that leaf N concentration was found to be the most important variable for yield prediction (r2=0.912). | |
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