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Changes in the Concentration of Leaf Nitrogen over the Season Affect the Diagnosis of Deficiency or Sufficiency in Strawberries in the Subtropics

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Menzel, C. M. (2018) Changes in the Concentration of Leaf Nitrogen over the Season Affect the Diagnosis of Deficiency or Sufficiency in Strawberries in the Subtropics. Agriculture, 8 (8). p. 126. ISSN 2077-0472

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Article Link: http://dx.doi.org/10.3390/agriculture8080126

Publisher URL: https://www.mdpi.com/2077-0472/8/8/126

Abstract

Optimum leaf nitrogen (N) concentrations have been identified for strawberry (Fragaria ×ananassa Duch.) in temperate and Mediterranean areas, but whether these values are appropriate for the subtropics is unclear. Two experiments were conducted for 2 years to determine if the seasonal changes in the concentration of leaf N affect the diagnosis of deficiency or sufficiency of strawberry plants in Queensland, Australia. In 2014, ‘Festival’, ‘Fortuna’, and ‘Winter Dawn’ were planted in early April and grown with and without N for the entire season. Then, ‘Festival’ was planted the following year in mid- or late April and, again, was grown with and without N. Yield was slightly lower with N in 2014, but higher with it the following year, particularly in the early planting. The concentration of total N in young, fully expanded leaves decreased from 3.0% to 2.0% as leaf, crown, and root dry weight increased, while the concentration of nitrate-N (NO3-N) decreased from 1200–3200 to 50–500 mg/kg. These changes in leaf N were large enough to affect the diagnosis of N deficiency or sufficiency. The concentration of leaf N was less variable than the concentration of leaf NO3-N and, therefore, better for estimating the nutrient status of strawberry plants in the subtropics.

Item Type:Article
Business groups:Horticulture and Forestry Science
Keywords:fertilisers; Fragaria ×ananassa Duch.; leaf nitrogen concentration; plant growth; yield
Subjects:Agriculture > Agriculture (General) > Fertilisers
Plant culture > Fruit and fruit culture > Berries and small fruits
Live Archive:06 Mar 2019 05:00
Last Modified:11 May 2022 02:06

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