Nitrogen Metabolism and Yield Response to Increases in Nitrogen−Phosphorus Fertilization:  Improvement in Greenhouse Cultivation of Eggplant (Solanum melongena Cv. Bonica)

Abstract

The effect that application of nitrogen−phosphorus (NP) rates exerts on some parameters of nitrogen metabolism and on yield in aubergine plants (eggplant, Solanum melongena cv. Bonica) was studied. All plants were grown under controlled conditions in an experimental greenhouse. The treatments consisted of the combination of three rates of N in the form of KNO3 (N1: 15 g m-2, N2: 22.5 g m,-2 and N3: 30 g m-2) together with two rates of P in the form of H3PO4 (P1: 24 g m-2 and P2: 36 g m-2), for a total of six treatments. Results indicate that regardless of the P rate applied, an increase in the N fertilizer increased NO3- assimilation as well as total and commercial yield. Use of the P2 rate favored all of these processes in comparison with the results obtained with the P1 rate, in addition to notably reducing the foliar levels of NO3- and noncommercial yield. Keywords: Solanum melongena L.; NP fertilization; nitrogen assimilation; yield

Biparental inbreeding depression, genetic relatedness and progeny vigour in a wind-pollinated treeline species in Argentina

“…Möcker et al 1998;Jung et al 1999;Sutter et al 2002). As plant growth is dependent on an adequate nitrogen supply in order to form amino acids, proteins, nucleic acids and other cellular constituents (López-Cantarero et al 1997), there is a potentially far-reaching influence of nitrogen metabolism on plant development, and nitrogen limitation may have important consequences for secondary metabolism and plant fitness (Stitt et al 2002). There is also evidence that effective N-uptake and active N-metabolism may be the crucial factors for survival of tree seedlings at treelines (Weih and Karlsson 1999a, b).…”

Yield and biosynthesis of nitrogenous compounds in fruits of green bean (Phaseolus vulgaris L cv Strike) in response to increasing N fertilisation

“…4 However, the excessive use of nitrogenous fertiliser in the form of NO 3 − can increase the concentration of this anion in foods of vegetal origin. 5 An excess of N in general harms the quality of fruits and their commercial yield, 3,6,7 in addition to polluting aquifers as well as surface water by leaching.…”

“…4 However, the excessive use of nitrogenous fertiliser in the form of NO 3 − can increase the concentration of this anion in foods of vegetal origin. 5 An excess of N in general harms the quality of fruits and their commercial yield, 3,6,7 in addition to polluting aquifers as well as surface water by leaching. 8 Few works have studied N metabolism in fruits, 9 but one of the enzymes that participates in N assimilation is known to be glutamine synthetase (GS), which catalyses glutamine synthesis from glutamate, ATP and NH 4 + .…”

The Nutritive Value of Wastewater Grown Barley and its Utilization in Fish Feed

“…The wastewater application rate had a significant impact (p = 0.009) on the crop height ( Table 3). The crop height increased as the wastewater application rate was increased because the plants were provided with more nutrients [9][10][11] . Clarkson and Lane [12] evaluated the feasibility of using hydroponically grown barley to reduce the mineral content of wastewater from an aquarium stocked with common carp (Cyprinus carpio) and rainbow trout (Oncorhynchus mykiss) and reported good plant growth of barley, which had reached a height of 20-22 cm in 6-10 days.…”

“…The wastewater application rate had a significant impact(p = 0.040) on the crop yield ( Table 4). The crop yield increased as the wastewater application rate was increased due to the additional nutrients supplied to the plants [9][10][11] . MacKenzie [14] evaluated the use of hydroponically grown wheat to reduce the nutrient content of an anaerobically digested dairy manure.…”