Development, photosynthesis and yield of blueberry cultivar ‘Climax’ growth with different substrates and nitrogen fertilization under protected cultivation

Abstract

Organic farming techniques gained popularity recently. Despite this increasing demand, there are still many problems, when comparing nutrient sources in organic and conventional farming systems. The study had as objective to evaluate the development of blueberry plants cultivar ‘Climax’ under protected cultivation in a substrate with different proportions of organic material and doses of applied mineral N. The blueberry nursery plants ‘Climax’ were transplanted into plastic pots and kept under protected cultivation. The soil and sand proportions were 40 and 20%, respectively, of the volume capacity of each pot. The remaining 40% were filled with organic material (bovine manure) and sawdust in the proportions of 5 and 35% (S1), 20 and 20% (S2) or 35 and 5% (S3), respectively. The experimental design was in complete randomized blocks, and the treatments were distributed in a 3x3 factorial arrangement, with six replications. The first factor was the different formulations of substrates. The second factor was N fertilization at 0, 10, and 15 g N plant-1. Evaluations of canopy volume, total leaf area, chlorophyll content and gas exchanges were performed six and eighteen months after transplanting. Fruits were harvested according to their ripening. Higher proportions of organic material in the substrate showed a substantial increase on estimated leaf area, canopy volume, chlorophyll content and clear efficiency of carboxylation (A/Ci), especially in plants that was not fertilized with mineral N. The highest yield was reported for the substrate S2, with intermediary amount of organic material, without the application of mineral N fertilizer. Considering agronomic and physiological traits, blueberry plants on the substrate S2 (20% OM) showed the best results, without mineral N fertilizing, becoming viable the organic management system for potted ‘Climax’ blueberry plants under protected cultivation.

Response of Different Physiochemical Parameters of Wheat Genotypes (Triticum aestivum L. & Triticum durum L.) in Nutrient Stress Condition

“…The reduction of nitrate to nitrite was assayed in vitro by incubating the enzyme extract with KNO 3 in the presence of an electron donor (NADH). Nitrite was diazotized with sulphanilamide and then reacted with N-(1-naphthyl) ethylene diaminedihydrochloride (NEDD) to produce an azo dye which was measured spectrophotometrically at 540nm (Nicholas et al [13]). 0.2 g leaf sample was taken put it to 0.2 M phosphate buffer solution and 0.2M KNO 3 (3 ML).…”

Influence of organic fertilizers and silicon on the physiology, yield, and nutraceutical quality of the strawberry crop

“…En cultivo de pimiento Berova et al (2010) indican que la actividad fotosintética aumenta aproximadamente en un 32 % tratadas con biofertilizante líquido a base de lombriz, esto tal vez por el alto contenido de propiedades y nitrógeno que poseen las fuentes de fertilización orgánica. Mientras que en cultivo de arándano los efectos del sustrato con (5 % MO), aumentó la tasa de transpiración y redujo la eficiencia del uso instantáneo del agua (Viencz et al,2021).…”