Strategies for timing nitrogen fertilization of pear trees based on the distribution, storage, and remobilization of 15N from seasonal application of (15NH4)2SO4

Jiang, Haibo; Li, Hongxu; Zhao, Mingxin; Mei, Xinlan; Kang, Yalong; Dong, Caixia; Xu, Yangchun

doi:10.1016/s2095-3119(19)62758-9

Cited by 16 publications

(22 citation statements)

References 34 publications

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“…Similar results were reported on fleshy fruits in which higher N concentration during the early stage of fruit development and decline significantly thereafter during the fruit growth until maturity for lower nutrient uptake and a dilution effect (Brunetto et al, 2015;Jiang et al, 2020), scion to rootstock combination, environmental conditions, and cultural practices (Carranca et al, 2018;Quartieri et al, 2002). Thus, the overall impact of N rates on TCV indicated that to every addition of N above the moderate N rate, the impact for trees budded on Swingle was greater than those on Cleopatra rootstocks were.…”

Section: Leaf Tissue Concentrationsupporting

confidence: 81%

Split application of nutrients improve growth and yield of Huanglongbing‐affected citrus trees

Atta

Morgan

Mahmoud

2021

Soil Science Soc of Amer J

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 Split application of ground applied essential nutrients increase the availability of nutrients and decrease higher nutrient requirements. Split application of essential nutrients improves the availability and uptake of nutrients for adversely affected HLB-induced root density citrus trees, thus decrease leaching and reduce downstream ecosystems. The availability of essential nutrients increases vegetative growth. Vegetative growth improves fruit yield and quality.

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Section: Leaf Tissue Concentrationsupporting

confidence: 81%

Split application of nutrients improve growth and yield of Huanglongbing‐affected citrus trees

Atta

Morgan

Mahmoud

2021

Soil Science Soc of Amer J

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“…This implied that for every increase in N above the moderate N rate, the trees budded on Swc rootstocks responded higher compared with trees budded on Cleo rootstocks. Previous studies indicated that fleshy fruits responded to a higher N rate during the early stage of tree growth, and the reaction decline significantly in the later growth stages [47][48][49][50]. During spring seasons, the value of LAI reduces because of the cold winter season, massive leaf and branch drop, and fruit harvest, but it revives when the temperature increases during the spring seasons.…”

Section: Leaf Area Indexmentioning

confidence: 99%

Water and Soil Nutrient Dynamics of Huanglongbing-Affected Citrus Trees as Impacted by Ground-Applied Nutrients

et al. 2020

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The decrease in the rate of inflow and outflow of water—and thereby the uptake of plant nutrients as the result of Huanglongbing (HLB or citrus greening)—leads to a decline in overall tree growth and the development of nutrient deficiencies in HLB-affected citrus trees. This study was conducted at the University of Florida, Southwest Florida Research and Education Center (SWFREC) near Immokalee, FL from January 2017 through December 2019. The objective of the study was to determine the effect of rootstocks, nutrient type, rate, and frequency of applications on leaf area index (LAI), water relations (stomatal conductance [gs], stem water potential [Ψw], and sap flow), soil nutrient accumulation, and dynamics under HLB-affected citrus trees. The experiment was arranged in a split-split plot design that consisted of two types of rootstocks, three nitrogen (N) rates, three soil-applied secondary macronutrients, and an untreated control replicated four times. LAI significantly increased in response to the secondary macronutrients compared with uncontrolled trees. A significantly greater gs, and thus a decline in Ψw, was a manifestation of higher sap flow per unit LA (leaf area) and moisture stress for trees budded on Swingle (Swc) than Cleopatra (Cleo) rootstocks, respectively. The hourly sap flow showed significantly less water consumption per unit LA for trees that received a full dose of Ca or Mg nutrition than Ca + Mg treated and untreated control trees. The soil nutrient concentrations were consistently higher in the topmost soil depth (0–15 cm) than the two lower soil depths (15–30 cm, 30–45 cm). Mobile nutrients: soil nitrate–nitrogen (NO3-N) and Mg2+ Mg2+, Mn2+, Zn2+, and B leached to the lower soil (15–30 cm) depth during the summer season. However, the multiple split applications of N as Best Management Practices (BMPs) and optimum irrigation scheduling based on reference evapotranspiration (ETo) maintained soil available N (ammonium nitrogen [NH4-N] and NO3-N) below 4.0 mg kg−1, which was a magnitude 2.0–4.0× less than the conventional N applications. Soil NH4-N and NO3-N leached to the two lower soil depths during the rainy summer season only when trees received the highest N rate (280 kg ha−1), suggesting a lower citrus N requirement. Therefore, 224 kg ha−1 N coupled with a full Ca or Mg dose could be the recommended rate for HLB-affected citrus trees.

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“…e loss rate of wheat crops is 14%-55%, and that of autumn crops is 18%-55%. Most of the lost nitrogen enters groundwater and surface water, resulting in the continuous increase of nitrate nitrogen in groundwater and surface water, resulting in water eutrophication, resulting in a series of environmental problems, such as the destruction of water resources and aquatic resources, the reduction of the use value of water, the increase of the cost of water treatment, and even a threat to human health [3].…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Nitrogen Transport in Pear Trees Based on Ground Hyperspectral Remote Sensing and Digital Image Information

Fan

Wang

Zhang

et al. 2022

Journal of Chemistry

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To study nitrogen transport monitoring in pear trees based on ground-based hyperspectral remote sensing and digital image information. First, based on ground hyperspectral remote sensing and digital image information, combined with the characteristics of visible and near-infrared spectral data and digital image data, a beet nitrogen nutrition diagnosis model based on visible and near-infrared spectral and digital image information was established. The results showed that under water and nitrogen management conditions, the marked nitrogen use efficiency at soil profiles 15, 45, and 75 cm was 28.2%, 22.3%, and 16.3%, respectively. From the analysis of soil and plant nitrogen measured in this experiment, it can be seen that nitrogen nitrate fertilizer should be properly applied to pear trees in the future.

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Strategies for timing nitrogen fertilization of pear trees based on the distribution, storage, and remobilization of 15N from seasonal application of (15NH4)2SO4

Cited by 16 publications

References 34 publications

Split application of nutrients improve growth and yield of Huanglongbing‐affected citrus trees

Split application of nutrients improve growth and yield of Huanglongbing‐affected citrus trees

Water and Soil Nutrient Dynamics of Huanglongbing-Affected Citrus Trees as Impacted by Ground-Applied Nutrients

Monitoring of Nitrogen Transport in Pear Trees Based on Ground Hyperspectral Remote Sensing and Digital Image Information

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