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Accueil du site → Doctorat → Allemagne → 1999 → Effect of various foliar fertilizer formulations on growth and yield of Phaseolus vulgaris L.

Humboldt-Universität zu Berlin (1999)

Effect of various foliar fertilizer formulations on growth and yield of Phaseolus vulgaris L.

Mpabansi Antoine

Titre : Effect of various foliar fertilizer formulations on growth and yield of Phaseolus vulgaris L. suffering from insufficient root supply of nitrogen, magnesium and micronutrients

Auteur : Mpabansi Antoine

Université de soutenance : Humboldt-Universität zu Berlin

Grade : Doctor scientiarum agrariarum [Dr. sc. agr.] 1999

The aim of this study was to simulate as well specific (Mg-, Fe-, Mn- and Zn-deficiency) as complex nutrient deficiency situations in model systems using either nutrient solution or solid substrates and to investigate the effect of preventive or curative applications of foliar fertilizers on growth and yield of bean plants. Results may be summarized as follows : Insufficient supply of magnesium and iron or simultaneous deficiency in Fe, Mn and Zn resulted in highly significant reduction of growth and yield of bean plants. Effect of magnesium deficiency on growth and yield could be successfully compensated by preventive foliar fertilization. The applied micronutrient compounds were less successful in the case of iron deficiency or multiple micronutrient deficiency situations as compared to manganese or zinc deficiency. Nutrient deficiency during the generative phase resulted in dropping of flowers and pods. In deficient plants leaf fertilizer application was a precondition for pod formation. Since pod weight was not substantially affected by plant nutrition pod number was the decisive factor for pod yield. As a result of reduced nutrient supply in the substrates leaf concentration of investigated nutrients declined below critical deficiency levels. With exception of the Fe-deficiency variants application of foliar fertilizers successfully compensated for the decrease in leaf nutrient concentrations. The composition of Mg and micronutrient foliar fertilizers did not affect significantly plant growth, yield and nutrient uptake. For the investigated parameters of growth and yield formation preventive foliar application of magnesium fertilizers was significantly more effective as compared to curative application. Such distinctive differences in fertilizer effects with time of application could not be found in micronutrient fertilizers. Mg and micronutrient supply of as low as 10% of optimal supply during juvenile growth phase could guarantee undisturbed vegetative growth. Drastic decrease of magnesium or micronutrient supply during the reproductive phase resulted in a reduction of pod yield up to 60 – 80%. Foliar fertilizer application during the reproductive development significanty reduced dropping of reproductive organs and thus seed yields of more than 90% of control were achieved. Nevertheless after a successful inoculation with Rhizobium plants without a nitrogen start dressing had significantly lower growth and yields than those with a starter fertilization of 40 kg N/ha. With regard to seed yield the effects of nitrogen deficiency during the juvenile phase could not be compensated by late fertilization at the flowering stage. The combination of a late fertilization at the flowering stage and leaf application during pod filling resulted in decreased pod abscision and therefore in highest yields. Independently of treatments the raw protein content of the bean seeds approximated to 20%. Also other nutrients in te seeds were in the adequate range for Phaseolus bean.


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