The cultivation of grain legumes enjoys increasing popularity since several years. This development is not least triggered by agronomic and climatic changes as well as political measures. Agricultural production methods, increasingly focused on sustainability, now include the promotion of domestic protein crops, to revive demand for regionally produced food and feed.
Legumes – versatile and valuable for healthy farming
Grain legumes have excellent pre-crop effects. They improve soil structure, have a phytosanitary effect and, in symbiosis with nodule bacteria, supply themselves with nitrogen from the air, reducing the dependence on mineral nitrogen, hence the eco-footprint of the crop rotation. The balanced supply of the other necessary nutrients, however, is essential for a successful production.
- Protein and energy from the cultivation of protein plants.
- Potassium causes an increased formation of nodule bacteria and is thus the basis for high yields.
- Magnesium promotes protein formation and quality.
- Sulfur improves nitrogen utilization and is indispensable for protein synthesis.
Protein and energy in addition to feed
Soybeans, field beans, peas and lupins belong to the large-grain legume species. They are particularly rich in protein and have a high energy value. Whereas soybean is also an important vegetable oil producer, the latter, grain legumes are mainly used as feed, similar to soybean meal.
Sustainably high yields can only be achieved with an optimized production process. This also includes a targeted supply of nutrients. Grain legumes are able to fix nitrogen from the air via nodule bacteria. A prerequisite for an effective N2 fixation is, among others, optimum supplies of potassium, magnesium, and sulfur.
- fix atmospheric nitrogen with nodule bacteria, which is available as a sustainable N source for the following crop via the residues, remaining on the field,
- have generally deep tap roots – improving soil structure (field bean, lupin) and enabling nutrient uptake from deeper soil layers,
- promote soil fertility, as they leave behind a good, uncompacted, crumby soil structure, helping the promotion of stable humus forms,
- positively influence the water storage capacity and biological activity of the soil,
- contribute to a wider, more diversified crop rotation,
- interrupt the infection chain of soil-borne pathogens.
The most important nutrients for grain legumes
Potassium – is the basis of high yields
- Potassium is of great importance for N2 fixation by nodule bacteria and therefore for seed and protein yield.
- The effect is due to both increased formation of nodules and increased bacterial activity.
- A good supply of potassium promotes the formation of proteins from amino acids, as potassium activates important enzymes for this purpose.
- Grain legumes absorb almost the entire potassium requirement of 220-270kg/ha K2O within 6 weeks (shortly before flowering to end of flowering).
- Including the already dead leaves, the plants absorb about 170-200kg/ha K2O until maturity, of which about 40% is contained in the grains.
Magnesium and sulfur – for high protein content and quality
As protein-rich plants, grain legumes have high requirements for magnesium and sulfur.
- A good supply of magnesium to the crop guarantees continued assimilation of the leaves until harvest and therefore ensures optimized storage of the carbohydrates in the grains, promoting yield.
- Magnesium activates a large number of enzyme systems in protein metabolism, thus influencing protein content and quality.
- A good supply of sulfur leads to efficient use of fixed or absorbed nitrogen, promotig overall biomass production and yield.
- Sulfur is indispensable for the formation of sulfur-containing amino acids and consequently for the entire protein synthesis.
Fertilizer recommendations for grain legumes
Recommendation for soil fertilization
The following fertilization recommendations are calculated on the nutrient removal of the main crop product on the basis of optimum soil nutrient contents (in Germany, soil content class "C"). Surcharges for soil-specific losses due to leaching, fixation, or erosion are not taken into account.
ESTA® Kieserit gran.
Recommendation for foliar fertilization
Foliar fertilization effectively supplies the plant with the micronutrients boron, manganese, zinc, or copper.
It also supplements soil fertilization with rapidly available macronutrients such as magnesium and sulfur. During periods of strong growth, foliar fertilization secures the supply of peak demands and reliably ensures an optimum supply of nutrients even in dry conditions or when sulfur mineralization is too slow.
This ensures the best yields and qualities. If deficiency symptoms have already occurred, foliar fertilization provides an effective and quickest possible remedy.
A total of 20-25kg/ha EPSO Microtop in a 5% concentration, for meeting peak demands, i.e. for rectifying latent deficiencies of magnesium, sulphur and trace minerals. Product may be applied in several split applications.