Nitrogen, Phosphorus and Potassium Fertilization Interactions on the Photosynthesis of Containerized Citrus Nursery Trees

Abstract

Downloaded by [New York University] at 20:03 24 July 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 The objective of this research was to evaluate the nitrogen, phosphorus and potassium (NPK) fertilizer effect on the development of 'Valencia' sweet orange nursery trees budded on Rangpur lime rootstocks in a greenhouse using containers. The experiment was a complete (1/5) 5 3 factorial randomized blocks design. Treatments comprised five concentrations (g per plant) of N (1.25; 6.25; 11.25; 16.25; 21.25); K (0.42; 3.75; 6.22; 9.34; 12.45); and P (0.19; 0.89; 1.59; 2.29; 2.99). Carbon dioxide assimilation rate (A), transpiration rate (E), stomata conductance (g s ), and internal carbon dioxide (CO 2 ) concentration (Ci) and water use efficiency (WUE). Reducing sugar, sucrose and starch were evaluated. Response functions were adjusted and nutrient rates for maximum yield were presented. The results indicated that the high levels of N (>16.25 g per plant) interferes negatively on photosynthesis. Potassium at intermediate fertilization levels (from 3.75 to 6.22 g per plant) had positive effects on photosynthesis. But P had little interference on photosynthesis. Carbohydrates levels were not related to nutrients fertilized.

Optimizing Nitrogen Application for Growth and Productivity of Pomegranates

“…Nitrogen (N) is a major nutritional element in plants, required in many physiological and developmental processes such as photosynthesis [1], metabolite biosynthesis [2,3] and flowering [4]. Most N uptake in fruit trees occurs during the intensive vegetative growth and post-harvest phases [5].…”

EFFECT OF PHOSPHORUS ON N, P, K, Mg ACCUMULATION AND PLANT GROWTH OF DIFFERENT CITRUS ROOTSTOCKS

“…Moreover, Syvertsen (1987) reported that P level in leaves showed no relationship with photosynthetic in orange and pomelo seedlings. Bernardi et al (2015) reported that P had little interference on photosynthesis. Zambrosi et al (2013a) indicated that phosphorus uptake by young citrus plants in low-P soil depends on rootstock varieties and nutrient management.…”

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“…Pagrindiniai fotosintezei būtini veiksniai yra šviesa ir CO2. Maisto medžiagos taip pat lemia fotosintezės procesų efektyvumą beveik visuose etapuose (Bernardini et al, 2015). Paprastai ankstyvaisiais augimo tarpsniais fotosintezės produktyvumas yra mažas, vėliau jis didėja ir maksimumą pasiekia maždaug iki žydėjimo (Fageria ir kt., 2006).…”