Effect of nitrogen, phosphorus and potassium fertiliser rates on fruit yield, leaf mineral concentration and growth of young orange trees in the Sunraysia district

Sarooshi, RA; Weir, R. G.; Coote, BG

doi:10.1071/ea9910263

Cited by 3 publications

(1 citation statement)

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“…These results regarding the effect of N fertilization on fruit yield are in harmony with those obtained by other studies [23,24,32,51,52]. This can be explained by the significant and positive correlation founded between N fertilization rate and total fruit yield.…”

Section: Vegetative Growthsupporting

confidence: 90%

The Effect of Nitrogen Fertilization on Tree Growth, Fruit Yield and Quality of Clementine Nules on Two Citrus Rootstocks in the Gharb Region (Morocco)

Omari¹,

Beniken²,

Zouahri³

et al. 2023

Preprint

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The objective of the current study is to evaluate the effects of nitrogen rate N on tree growth, fruit yield and quality of clementine Nules variety, budded on Flhorag and Carrizo citrange rootstocks, grown on clay soils at the Experimental station of Sidi Allal Tazi, INRA Morocco, over five seasons. The experiment has been carried out in a split-plot design with three replications, including the nitrogen doses as the main plot and rootstock the subplot. Three fertilization treatments of the rates of N (g/tree) (T0: control (native nutrient), T1: 270, T2: 540 in g/tree) and 135 P2O5, 270 K2O g/tree have been applied to citrus trees in field conditions. The study found that nitrogen rate and rootstock genotype had significant effects on vegetative growth, yield, and fruit quality of Nules clementine. As N rate increased, vegetative growth improved significantly, with the trees grafted on Carrizo citrange and fertilized with T2 (540 N g/tree) showing the best results. A strong positive correlation was also observed between canopy volume and fruit yield for both rootstock genotypes. Carrizo citrange proved to be a more efficient rootstock for Nules variety than Flhorag, with higher yield and better fruit quality. As a conclusion, the recommended NPK rate for obtaining an optimal yield and good fruit quality of Nules clementine fruits was 540 N-135 P2O5-270 K2O g/tree/year under Sidi Allal Tazi–Gharb (Morocco) conditions.

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Section: Vegetative Growthsupporting

confidence: 90%

The Effect of Nitrogen Fertilization on Tree Growth, Fruit Yield and Quality of Clementine Nules on Two Citrus Rootstocks in the Gharb Region (Morocco)

Omari¹,

Beniken²,

Zouahri³

et al. 2023

Preprint

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Prospects for manipulating the vegetative-reproductive balance in horticultural crops through nitrogen nutrition: a review

Huett¹

1996

Aust. J. Agric. Res.

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This review examines the prospects for manipulating the vegetative-reproductive balance in horticultural crops through nitrogen (N) nutrition. It also examines whether incorrect timing or excessive applications of N stimulate vegetative growth at the expense of reproductive growth. Productivity of horticultural crops is dependent on an adequate N status because photosynthetic capacity is dependent on leaf N content per unit area. Efficient N uptake occurs during periods of active growth and depends on active photosynthesis. Most N in exposed leaves is accumulated as protein and the uptake and conversion to protein requires a carbohydrate (CHO) supply. A feedback mechanism has been proposed from shoots to roots in the control of N uptake, because ammonium and nitrate uptake do not increase at supraoptimal concentrations. Stored CHO and nutrients support actively growing shoots and inflorescences and while vegetative and reproductive meristems compete as sinks, fruit growth depends principally on current photosynthesis. Most of the season's N uptake by deciduous trees occurs during the post-fruit maturity period in late summer and autumn in vegetative growth which is remobilized prior to leaf fall in late autumn into storage. The N is redistributed the following spring to support new season leaf and fruit growth. In sand culture studies conducted with 2-year-old peach and apple trees, an N deficiency which led to inadequate tree N reserves in winter inhibited flowering, fruit set and vegetative growth the following spring. N applied during spring is poorly assimilated. For Prunus spp., 90% of the N contained in the spring vegetative flush is derived from storage, indicating that exogenous N applications at that time are unlikely to influence that season's growth. Vegetable crops which have high growth and N uptake rates compared with tree fruit crops (maximum N uptake rate for tomato 66 kg/ha.week v. peach 1.3 kg/ha.week) rely on exogenous N and current photosynthesis to support growth. In studies where very high N rates were applied to horticultural crops, tree crops were unaffected except in citrus where yield was depressed and tree size was unaffected. The growth and yield of most vegetable crops were depressed at high N rates while at these high N rates, tomato yields were increased while vegetative growth was unaffected. Where a depression in tomato growth occurred at high N rates, it was caused by a salt effect, although chloride at the same osmotic potential depresses growth much more than nitrate. In subtropical fruit and nut crops such as lychee, macadamia and avocado, timing and rate of N were not detrimental to yield. Soil N, tree N and CHO reserves buffer against an external N supply and hence the ability of applied N to manipulate the vegetative-reproductive balance. More work is required to establish the extent and subsequent effect of competition between the vegetative flushes and inflorescence growth for subtropical fruit crops in particular.

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Alternate Use of Good and Saline Irrigation Water (1:1) on the Performance of Tomato Cultivar

Elamin

Al-Wehaibi

2005

Journal of Plant Nutrition

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Effect of nitrogen, phosphorus and potassium fertiliser rates on fruit yield, leaf mineral concentration and growth of young orange trees in the Sunraysia district

Cited by 3 publications

References 0 publications

The Effect of Nitrogen Fertilization on Tree Growth, Fruit Yield and Quality of Clementine Nules on Two Citrus Rootstocks in the Gharb Region (Morocco)

The Effect of Nitrogen Fertilization on Tree Growth, Fruit Yield and Quality of Clementine Nules on Two Citrus Rootstocks in the Gharb Region (Morocco)

Prospects for manipulating the vegetative-reproductive balance in horticultural crops through nitrogen nutrition: a review

Alternate Use of Good and Saline Irrigation Water (1:1) on the Performance of Tomato Cultivar

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