The effect of phosphorus and nitrogen deficiency on growth of seedlings of spring barley in dependence on irradiance: Content of chlorophyll, nitrogen and phosphorus

Nátr, L.; Apel, P.; Fialová, Svatava

doi:10.1007/bf02903142

Cited by 10 publications

(1 citation statement)

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“…N deficiency together with adequate P nutrition has been shown to induce excess P uptake by algae (Chu et al, 2013, 2014, 2015); Zhu et al, 2015). A similar trend of increased P uptake under N-deficient conditions has also been reported for spring barley (Nátr et al, 1983), Tef ( Eragrostis tef Trotter) (Gashu et al, 2020) and almond trees (Sperling et al, 2019). The mechanism by which high fruit:leaf ratio driven by N-deficient conditions induces high leaf-P and K concentrations in fruit trees is probably complex and may include several steps: (i) enhanced gas-exchange activities – a high fruit:leaf ratio induced a high demand for carbohydrates and subsequently, enhanced stomatal conductance and photosynthetic activity (Fig.…”

Section: Discussionsupporting

confidence: 81%

Nitrogen uptake and macronutrients distribution in mango trees (cv. Keitt) under three N fertigation treatments

Silber¹,

Goldberg

Shapira

et al. 2021

Preprint

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We assessed the effects of N concentration in the irrigation water on nutrient uptake and distribution in leaves and fruit of mango cv. Keitt grown in a lysimeter for four years. We applied three treatments: N1, no N fertilization (less than 2 mg/L in the tap water); N2, 10 mg/L N; N3, 20 mg/L N. Deficient N conditions (N1) generated low vegetative yield, high fruit:leaf ratio, high photosynthetic activity, high leaf P and K concentrations, and high sugar content along with low acidity in the fruit. Excess N concentration (N3) induced vegetative growth, and reduced fruit yield and gas-exchange characteristics. The calculated annual nitrogen uptake heavily depended on the nitrogen supply (N1-26 g/tree; N2-196 g/tree; N3- 185 g/tree). Fruits were the major N sink being 0.82, 0.26 and 0.05 from the total annual N supplied. The N quantities accumulated in N1 fruits during the reproductive season (May-August), were above the N quantities supplied via fertigation, suggesting that N reserve in the vegetative tissues supplied the fruits high N demand. The finding shows the importance of adequate nitrogen supply to mango trees and the dangers of excessive fertilization.

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