Abstract:-The objective of this work was to determine the influence of Zn, Mn and Cu on shoot dry matter yield and uptake of macro and micronutrients in upland rice, common bean and corn. Six greenhouse experiments were conducted using a Dark Red Latosol (Typic Haplusthox). Treatments consisted of application of Zn at 0, 5, 10, 20, 40, 80 and 120 mg kg -1 , of Mn at 0, 10, 20, 40, 80, 160, 320 and 640 mg kg -1 and of Cu application at 0, 2, 4, 8, 32, 64 and 96 mg kg -1 . Zinc increased yield of rice, Mn increased yield… Show more
“…The interaction between zinc and nitrogen was non-significant. The application of zinc also improved the leaf area per plant which might be due to the fact that zinc has role in proper functioning of photosynthetic enzymes (Fageria 2002). Our results confirm the investigation of Mehdi et al (2012) who suggested that application of 10 kg ha -1 zinc in maize fodder increases plant height and leaf area.…”
Section: Resultssupporting
confidence: 90%
“…Nitrogen makes the plant succulent by absorbing more amount of water and increase the fresh weight but the effectiveness of zinc for increasing the dry biomass is clear from the results that zinc helped to increase dry biomass parallel with nitrogen. This is due the fact that zinc affects nitrogen uptake and its metabolism (Fageria 2002 Sharifi and Taghizadeh (2009) that zinc increased nitrogen uptake and nitrogen content due to synergistic effect which affect the protein formation. Zinc and nitrogen enhanced the percentage of crude protein which resulted in improvement in forage quality.…”
Zinc (Zn) deficient soil prevails throughout the world and it has become the bottleneck in achieving production potential and quality of crops. The negligible use of micronutrients along with irregular use of macronutrients is practised for fodder production in Pakistan. Varying levels of zinc (0, 5, 10 and 15 kg ha -1 ) and nitrogen (0, 60, 120 and 180
“…The interaction between zinc and nitrogen was non-significant. The application of zinc also improved the leaf area per plant which might be due to the fact that zinc has role in proper functioning of photosynthetic enzymes (Fageria 2002). Our results confirm the investigation of Mehdi et al (2012) who suggested that application of 10 kg ha -1 zinc in maize fodder increases plant height and leaf area.…”
Section: Resultssupporting
confidence: 90%
“…Nitrogen makes the plant succulent by absorbing more amount of water and increase the fresh weight but the effectiveness of zinc for increasing the dry biomass is clear from the results that zinc helped to increase dry biomass parallel with nitrogen. This is due the fact that zinc affects nitrogen uptake and its metabolism (Fageria 2002 Sharifi and Taghizadeh (2009) that zinc increased nitrogen uptake and nitrogen content due to synergistic effect which affect the protein formation. Zinc and nitrogen enhanced the percentage of crude protein which resulted in improvement in forage quality.…”
Zinc (Zn) deficient soil prevails throughout the world and it has become the bottleneck in achieving production potential and quality of crops. The negligible use of micronutrients along with irregular use of macronutrients is practised for fodder production in Pakistan. Varying levels of zinc (0, 5, 10 and 15 kg ha -1 ) and nitrogen (0, 60, 120 and 180
“…This cofactor role of micronutrients is crucial for enzyme and nonenzyme activities in plant metabolism under different environmental conditions (Table 2). For instance, Zn specifically plays a role in the enzymatic processes involved in the biosynthesis of the plant growth regulator, auxin (Hossain et al 1997;Fageria 2002). This is an important function given the role of auxins in enhancing root growth, with agronomic consequences in terms of allowing the plant greater ability to access nutrients and water.…”
Section: Physiological Roles and Roles In Abiotic And Biotic Stress Mmentioning
Micronutrients are essential mineral elements required for both plant and human development. However, micronutrients are often lacking in soils, crop, and food. Micronutrients are therefore used as fertilizer to increase crop productivity, especially when the application of conventional NPK fertilizers is not efficient. Here, we review the application of micronutrients in crop production. Reports show that micronutrients enhance crop nutritional quality, crop yield, biomass production, and resiliency to drought, pest, and diseases. These positive effects range from 10 to 70 %, dependent on the micronutrient, and occur with or without NPK fertilization. We discuss the uptake by plants of micronutrients as nanosize particulate materials, relative to conventional uptake of ionic nutrients. We also show that packaging of micronutrients as nanoparticles could have more profound effects on crop responses and fertilizer use efficiency, compared to conventional salts or bulk oxides.
“…Significant variation in shoot dry weight among tropical legume cover crop species grown on Brazilian Oxisol has been reported by Fageria et al [10]. Similarly, response to Cu fertilization by legume crops grown in acidic Cerrado soils has been reported by Fageria [11] and Fageria [12]. Lucas and Knezek [13] reported that for responsive crops the Cu concentration should exceed 4 to 6 mg kg −1 for mineral soils and 20 to 30 mg kg −1 for organic soils.…”
Cover crops are important components of cropping systems due to their role in improving soil quality. Lack of adequate levels of soil micronutrients prevents the success of cover crops in highly weathered tropical soils. A greenhouse experiment was conducted with the objective to evaluate copper use efficiency of nine tropical legume cover crops. The copper levels used were 0, 5, 10 and 20 mg Cu kg −1 of soil. Shoot dry weight, maximum root length and root dry weight significantly increased in a quadratic fashion with increasing soil Cu levels in the range of 0 to 20 mg kg −1 soil. Cu x cover crops interactions for shoot dry weight, root dry weight, maximum root length and contribution of root to the total dry weight were significant, indicating different responses of cover crops with the variation in soil Cu levels. Overall, maximum shoot dry weight was obtained with the application of 13 mg Cu kg −1 . Similarly, maximum root dry weight and maximum root length were obtained with the application of 12 and 14 mg Cu kg −1 of soil. Root dry weight and maximum root length were significantly and positively related to shoot dry weight, indicating that a vigorous root system is important for improving productivity of cover crops grown on Brazilian Oxisols, especially where deficiency of micronutrients such as Cu exists. The Cu concentration in the plant tissue decreased in a quadratic fashion whereas, Cu uptake increased with increasing Cu application rate from 0 to 20 mg kg −1 soil. There was a significant variation observed in Cu use efficiency among cover crop species. Increasing applied Cu levels significantly increased soil pH and Mehlich 1 extractable soil Cu, Zn, Mn and Fe concentrations in the soil solution.
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