Scholarlink

<p>In the present investigation, the effects of N, P and&#xa0;K deficiencies and excess treatments were identified in two pomegranate plant cultivars (‘Gabsi’ and ‘Kalaii’). In an attempt to understand those effects, the “missing element technique” and the application of “overdoses” of a&#xa0;specific element in greenhouse were assessed to evaluate vegetative growth, some physiological traits, leaf mineral content, and the symptomology. The absence of those elements resulted in a&#xa0;low leaf mineral concentration: 0.81%, 0.22% and 0.09% for deficient treatments in ‘Gabsi’ cultivar, compared to the control: 1.68%, 0.46% and 0.47%, respectively, for N, P and&#xa0;K elements. For ‘Kalaii’ cultivars, the concentrations under deficiency were 0.63%, 0.23% and 0.16%, while those for the control plants were 1.69%, 0.68% and 0.46%, respectively, for N, P and&#xa0;K elements. Reduced vegetative growth was observed in the absence of those macronutrients, where plants showed the lowest shoot elongation: 0.2 cm, 0.45 cm 0.13 cm and 0.2 cm, 0.26 cm, 0.3 cm, respectively, for N, P and&#xa0;K, in ‘Gabsi’ then ‘Kalaii’ cultivars. Leaf chlorophyll content decreased when plants were deprived from macronutrients. For ‘Gabsi’ cultivar, SPAD values declined from 58.99 to 18.26, 32.16 and 37.25, respectively, for N‑Free, P‑Free and K‑Free treatments. For ‘Kalaii’ plants, values went from 55.69 to 11.70, 32.40 and 34.55. The maximum quantum efficiency of photosystem&#xa0;II (PS&#xa0;II) also estimated by Fv/Fm in both cultivars dropped in all deficient treatments: It was less than 0.4, while for the control it was 0.7 in ‘Gabsi’ plants. For ‘Kalaii’ cultivar, the values were 0.35, 0.45 and 0.48, respectively, for N, P and&#xa0;K free treatments. Some leaf characteristics were negatively affected by the macronutrient deficiency such as specific leaf area (SLA), leaf tissue density (LTD), succulence (SUC), while some others remained unchanged, such as water content at saturation (WCS). Visual symptoms of N&#xa0;deficiency were mainly chlorosis and yellowish leaves appearing after only 15&#xa0;days of treatment. For P&#xa0;deficiency, the symptoms were light chlorosis that became necrosis, appearing after 45&#xa0;days of treatment, whereas for K&#xa0;element, symptoms of deficiency were necrotic spots appearing after 30&#xa0;days of treatment. Some deformations of leaf shape were also observed. Plants exposed to an excessive supply of macronutrients did not show any negative effect in leaf mineral concentration, for both cultivars and for all elements; excessive treatments showed higher values: 1.72%, 0.98% and 0.84% for N, P and&#xa0;K, respectively, in ‘Gabsi’ cultivar, while those for ‘Kalaii’ were 2.1%, 0.84% and 0.54%. Chlorophyll content, Fv/Fm, and some leaf characteristics presented no significant difference compared to the control. Treatments with excess of nutrients showed, as visual symptoms, a&#xa0;strong greenish color of leaves and greater vegetative growth mainly for&#xa0;K. Both ‘Gabsi’ and ‘Kalaii’ cultivars displayed comparable responses to nutrient deficiencies and excesses, highlighting the critical role of nutrient management in optimizing pomegranate growth. By understanding these specific effects, we can improve agricultural practices and enhance the productivity of pomegranate trees.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Nutritional Diagnosis and Morphophysiological Traits of Two Pomegranate Cultivars Under Macronutrient (N, P, K) Deficiencies and Excess

  • 期刊论文

  • 发表日期：

    2025年1月3日

查看全文
  • Azhar Ouni,
  • Samia Abboud,
  • Sahar Abdelwahab,
  • Darine Tlili,
  • Soumaya Dbara,
  • Messaoud Mars

摘要

In the present investigation, the effects of N, P and K deficiencies and excess treatments were identified in two pomegranate plant cultivars (‘Gabsi’ and ‘Kalaii’). In an attempt to understand those effects, the “missing element technique” and the application of “overdoses” of a specific element in greenhouse were assessed to evaluate vegetative growth, some physiological traits, leaf mineral content, and the symptomology. The absence of those elements resulted in a low leaf mineral concentration: 0.81%, 0.22% and 0.09% for deficient treatments in ‘Gabsi’ cultivar, compared to the control: 1.68%, 0.46% and 0.47%, respectively, for N, P and K elements. For ‘Kalaii’ cultivars, the concentrations under deficiency were 0.63%, 0.23% and 0.16%, while those for the control plants were 1.69%, 0.68% and 0.46%, respectively, for N, P and K elements. Reduced vegetative growth was observed in the absence of those macronutrients, where plants showed the lowest shoot elongation: 0.2 cm, 0.45 cm 0.13 cm and 0.2 cm, 0.26 cm, 0.3 cm, respectively, for N, P and K, in ‘Gabsi’ then ‘Kalaii’ cultivars. Leaf chlorophyll content decreased when plants were deprived from macronutrients. For ‘Gabsi’ cultivar, SPAD values declined from 58.99 to 18.26, 32.16 and 37.25, respectively, for N‑Free, P‑Free and K‑Free treatments. For ‘Kalaii’ plants, values went from 55.69 to 11.70, 32.40 and 34.55. The maximum quantum efficiency of photosystem II (PS II) also estimated by Fv/Fm in both cultivars dropped in all deficient treatments: It was less than 0.4, while for the control it was 0.7 in ‘Gabsi’ plants. For ‘Kalaii’ cultivar, the values were 0.35, 0.45 and 0.48, respectively, for N, P and K free treatments. Some leaf characteristics were negatively affected by the macronutrient deficiency such as specific leaf area (SLA), leaf tissue density (LTD), succulence (SUC), while some others remained unchanged, such as water content at saturation (WCS). Visual symptoms of N deficiency were mainly chlorosis and yellowish leaves appearing after only 15 days of treatment. For P deficiency, the symptoms were light chlorosis that became necrosis, appearing after 45 days of treatment, whereas for K element, symptoms of deficiency were necrotic spots appearing after 30 days of treatment. Some deformations of leaf shape were also observed. Plants exposed to an excessive supply of macronutrients did not show any negative effect in leaf mineral concentration, for both cultivars and for all elements; excessive treatments showed higher values: 1.72%, 0.98% and 0.84% for N, P and K, respectively, in ‘Gabsi’ cultivar, while those for ‘Kalaii’ were 2.1%, 0.84% and 0.54%. Chlorophyll content, Fv/Fm, and some leaf characteristics presented no significant difference compared to the control. Treatments with excess of nutrients showed, as visual symptoms, a strong greenish color of leaves and greater vegetative growth mainly for K. Both ‘Gabsi’ and ‘Kalaii’ cultivars displayed comparable responses to nutrient deficiencies and excesses, highlighting the critical role of nutrient management in optimizing pomegranate growth. By understanding these specific effects, we can improve agricultural practices and enhance the productivity of pomegranate trees.