Quality in the pepper under different fertigation managements and levels of nitrogen and potassium

Abstract

-The rational use of nutrients is of fundamental importance for obtaining high productivity of high nutritional quality. This work was developed with the aim of evaluating the quality of pepper fruit grown under different fertigation managements and different levels of nitrogen and potassium. The experimental design was of randomised blocks in a 3 x 6 factorial scheme with four replications. The treatments resulted from the combination of three fertigation managements (M 1 -based on the rate of absorption; M 2 -monitoring the conductivity of the soil solution; M 3 -monitoring concentrations of N and K ions in the soil solution) with six levels of N and K (N 0 K 0 , N 50 K 50 , N 100 K 100 , N 150 K 150 , N 200 K 200 and N 300 K 300 ) as a percentage of the recommended dosage for the crop under conventional fertigation (M 1 ) or hydroponics (M 2 and M 3 ). Fruit quality was evaluated for the following characteristics: pH, soluble solids, titratable acidity, vitamin C content and the ratio of soluble solids to titratable acidity. The different fertigation managements only affected the levels of soluble solids (SS) and titratable acidity (TA), reducing the SS and TA. The variables under study were adjusted for the levels of N and K using quadratic models.

Soil chemical attributes in beet cultivation under different fertigation and salinity managements

“…5.1a¹ 10.1 a 24.7a 517.7a 38.0a 19a 60a 7.8a 87a 125a 68a 0.7a M2 5.1a 8.9 a 22.5b 446.5a 37.5a 15b 64a 10.2b 89a 126a 70a 0.6b MSD 0.1 1.5 1.9 94.1 1.8 2.6 7.1 1.6 10 10.3 2.8 0.08 Parameters such as SB and CEC also had an influence on the soil electrical conductivity, with linear adjustment (Table 5). In the literature, studies involving fertigation managements have shown reductions in the productive and qualitative parameters of crops (Oliveira et al, 2015;Silva et al, 2013b;Eloi et al, 2011), caused by the high concentrations of fertilizers applied, as observed in the present experiment, with damage to the plants in any of the studied managements (Silva et al, 2015b), depending, obviously, on the tolerance of the cultivated crop.…”

Effects of Chicken Manure and Plantain Peel-Based Fertilization on Kalenda Eggplant (Solanum melongena L) Fruit Biochemical Parameters

“…According to [21], the high nutritional value of fruits stemming from treatments T3 (chicken manure + plantain peel potash) and T5 (NPK (10 18 18) + Urea (46% N) + Potassium sulphate (K 2 SO 4 )) in minerals, especially in potassium, phosphorus and carbohydrate would be due to an indirect effect of nitrogen which, by stimulating photosynthesis, might increase the production of soluble sugars. The same authors report that high nutrient values could also be explained by the decrease in the osmotic pressure of the soil solution (i.e.…”