Articles
EFFECT OF NK LEVEL ON THE UPTAKE AND NUTRIENT DISTRIBUTION IN PEPPER PLANT UNDER GREENHOUSE IN THE MEDITERRANEAN AREA
Article number
927_59
Pages
469 – 474
Language
English
Abstract
The use of high amounts of fertilizers in greenhouse production leads to important environmental problems due to the leaching of elements.
The knowledge on plant nutritional requirements is required to attain and develop a technical efficiency.
This work studies the influence of different levels of NK supply, applied by fertigation, on uptake and nutrient distribution in pepper.
The experiment was conducted in a polyethylene greenhouse Aifos pepper crop, on a sand-mulched sandy loam soil with trickle irrigation.
The experimental design was randomized blocks with four blocks.
Five NK fertilization levels (N0K0, N1K1, N1K1.5, N1.5K1 and N1.5K1.5), were established, being the treatment N1K1 the recommended rate corresponding to 12.5 g m-2 of N and 19.3 g m-2 of K and average nutrient concentrations: 9.8 mM of N(NO3–+ NH4+) and 5.4 mM of K. Dry matter and content of nutrients (N, P, K, Ca and Mg) were determined for different plant parts (pruning rests, fruit, leaf, and stem) for the whole season.
The results show that the highest NK levels increase the N, P, K, and Mg uptake by the plant.
The N1.5K1.5 treatment presents the highest uptake of N, related to a bigger production of dry matter.
All treatments shows a high productive efficiency (PE) of NPK, with the fruit as a principal nutrient sink in all the cases.
Treatment N1.5K1.5 presented the highest PE of N. The main mineral constituent of the pepper plant was K, surpassing the N content, and the minor constituent was P. Plant nutrient distribution showed the same behavior for N, P, and K, the fruit being the nutrient sink.
On the other hand, the same tendency was observed for Ca and Mg, stored mainly in the leaf.
The knowledge on plant nutritional requirements is required to attain and develop a technical efficiency.
This work studies the influence of different levels of NK supply, applied by fertigation, on uptake and nutrient distribution in pepper.
The experiment was conducted in a polyethylene greenhouse Aifos pepper crop, on a sand-mulched sandy loam soil with trickle irrigation.
The experimental design was randomized blocks with four blocks.
Five NK fertilization levels (N0K0, N1K1, N1K1.5, N1.5K1 and N1.5K1.5), were established, being the treatment N1K1 the recommended rate corresponding to 12.5 g m-2 of N and 19.3 g m-2 of K and average nutrient concentrations: 9.8 mM of N(NO3–+ NH4+) and 5.4 mM of K. Dry matter and content of nutrients (N, P, K, Ca and Mg) were determined for different plant parts (pruning rests, fruit, leaf, and stem) for the whole season.
The results show that the highest NK levels increase the N, P, K, and Mg uptake by the plant.
The N1.5K1.5 treatment presents the highest uptake of N, related to a bigger production of dry matter.
All treatments shows a high productive efficiency (PE) of NPK, with the fruit as a principal nutrient sink in all the cases.
Treatment N1.5K1.5 presented the highest PE of N. The main mineral constituent of the pepper plant was K, surpassing the N content, and the minor constituent was P. Plant nutrient distribution showed the same behavior for N, P, and K, the fruit being the nutrient sink.
On the other hand, the same tendency was observed for Ca and Mg, stored mainly in the leaf.
Authors
M.L. Segura , J.I. Contreras, C. García-Delgado , E. Eymar
Keywords
Capsicum annuum, fertigation, sand mulch, nutrient uptake
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