Publication Date
1989
Description
Red clover is a precious and promising fodder crop in Poland. Even on acid soils its yields are satisfying, if sufficient level of exchangeable Ca is present. Symbiotically fixed N covers N needs, but fixing effectiveness and rate of further changing of nitrogen compounds depends on optimal molybdenum supply. It is a component of such enzymes as nitrogenase and nitrate reductase, which make it necessary for Rhizobium as well as clover. However, Mo surplus is toxic for animals (the relation of Mo:Cu is of importance). As other leguminous plants, red clover needs much boron. Yield of 15 t of dry matter (DM) ha-1 uptakes 300 - 700 g of N. Boron is necessary in nucleic acids and P exchanges, protein synthese, carbohydrates transport. It plays an important part in generative development and meristematic tissue functioning. Both micronutients - B and Mo - are taken up passively - proportionally to their soil content. Therefore, their surplus in soil leads to its toxicity for plants (B) or animals (Mo). Mo is extracted from soil by oxalate solution according to Grigg method all over the world. Criterions of interpretation however are controversial. For boron extraction hot water is commonly used. All broadly known threshold values for soil micronutrients are generalised as universal for each plant species. "Excessive" level is usually omitted. It was decided to elaborate threshold values for red clover and other legumes to optimize its fertilization.
Citation
Gembrazewski, H, "Red Clover Needs for Mobybdenum and Boron Soil Threshold Values of Deficiency and Toxicity" (2025). IGC Proceedings (1989-2023). 17.
https://uknowledge.uky.edu/igc/1989/session1/17
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Red Clover Needs for Mobybdenum and Boron Soil Threshold Values of Deficiency and Toxicity
Red clover is a precious and promising fodder crop in Poland. Even on acid soils its yields are satisfying, if sufficient level of exchangeable Ca is present. Symbiotically fixed N covers N needs, but fixing effectiveness and rate of further changing of nitrogen compounds depends on optimal molybdenum supply. It is a component of such enzymes as nitrogenase and nitrate reductase, which make it necessary for Rhizobium as well as clover. However, Mo surplus is toxic for animals (the relation of Mo:Cu is of importance). As other leguminous plants, red clover needs much boron. Yield of 15 t of dry matter (DM) ha-1 uptakes 300 - 700 g of N. Boron is necessary in nucleic acids and P exchanges, protein synthese, carbohydrates transport. It plays an important part in generative development and meristematic tissue functioning. Both micronutients - B and Mo - are taken up passively - proportionally to their soil content. Therefore, their surplus in soil leads to its toxicity for plants (B) or animals (Mo). Mo is extracted from soil by oxalate solution according to Grigg method all over the world. Criterions of interpretation however are controversial. For boron extraction hot water is commonly used. All broadly known threshold values for soil micronutrients are generalised as universal for each plant species. "Excessive" level is usually omitted. It was decided to elaborate threshold values for red clover and other legumes to optimize its fertilization.
