Herter Cereais Ltda

We produce and market Nutrition & Quality Seeds. <br><br>Currently, seed quality is being focused on all aspects, and increasingly required, standardized and encouraged by the globalization of the economy by printing production efficiency in the agricultural system. This scenario makes the best agricultural production systems in the world are our direct competitors. The efficiency of production factors often depends on the seed used and therefore has a number of advantages associated with the use of quality seeds, such as: a) higher seedling resistance to pests and diseases early, b) production a more appropriate and uniform stand, thus contributing to higher early plants, c) the seedlings are more tolerant to stress the initial d) the risks are significantly reduced replanting e) the need of seeds per area is reduced, f) possibility of an emergency faster and more vigorous growth of root system, etc.. <br><br>The quality of seed, characterized by genetics, physical, health and physiological influences the development of culture. The effects of nutrients on growth and production are usually studied in terms of their functions in plant metabolism, and growth. Any change in the level and / or change the balance of these nutrients involved in metabolism, leading to changes in morphology, anatomy and chemical composition of the seed. Thus, it is known the role of nutrients in crop production, especially nitrogen and potassium and these can affect the quality of seeds, being characterized as important factors in crop establishment. Low quality seed germination and vigor are reduced, resulting in crops with low plant population, synonymous with economic loss. <br><br>One of the basic points for the study of seed quality would be from the membrane systems, particularly through the integrity of cell membranes, which often play an essential mineral nutrients. Otherwise, ie, the disruption of the integrity, leading to increased permeability, featuring one of the first signs of deterioration and reduced seed quality. <br><br>This fact can be explained by the disruption in the structure of membranes, causing increased leaching (sugars, amino acids, inorganic ions such as K, Ca, Mg) with loss of seed quality. As in the bulletins of fertilizer recommendation does not exist any inference from the effects of nutrition on seed quality studies that relate these aspects become important, combining the high production quality. Theoretically, nitrogen is the element of quality, since it is part of the composition of proteins. Thus, the nitrogen interferes with the protein content of seeds, which can affect their quality since the storage proteins are hydrolysed during germination to supply the nitrogen, sulfur and carbon skeletons required to the embryonic axis and seedling stages during the initial development. Therefore, reducing the amount of protein in the seed can cause you more rapid deterioration. Thus, nitrogen fertilization, and the effect on productivity, can influence the protein content of seeds. In wheat, the protein content in seeds has been positively correlated with force. In oats, the effect of nitrogen topdressing at panicle emergence on seed quality, is not influenced by N rates, except in size. In bean, the nitrogen does not affect the quality of seeds. Another possible explanation for the lack of response of nitrogen in protein content would increase the non-protein nitrogen, the low activity of reduction of nitrate or ammonium and, sometimes, the low concentration of molybdenum. <br><br>For maize, nitrogen has significant influence on the quality of production in the culture that is, increasing the concentration of zein and reduction of lysine and tryptophan, with nitrogen. In maize, studies indicate that nitrogen and to increase productivity and improve grain quality in terms of protein and nutrients (P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn), increase thousand kernel weight, which can be explained by differences in the actual period of grain filling. While potassium has a positive influence on the quality of corn seeds. <br><br>There are certain situations where application of potassium does not increase production directly in view of the K concentrations in soil (medium to high level), although other effects are seen as better retention of pods on the stem, reduction and improvement of dehiscence seed quality. The relationship between potassium fertilization and quality of soybeans is essential for seed production. The main benefits of potassium in soybean are: reduction of dehiscence of the pods and the level of Phomopsis sp in the seed, uniform plant maturation, germination and increased the weight of 100 seeds.<br><br>The quality of soybean seeds (measured by its size and visual appearance) has a positive influence when the potassium fertilization is included in the initial culture. It should be noted that potassium in the seed plants, seems so important that it became part of the methodology of seed laboratories to verify its robustness. Therefore, the potassium leaching test consisted in an efficient option for evaluating the physiological quality of seeds. Thus, the importance of mineral nutrition in improving the quality of seeds is explained by the process of absorption of nutrients from the mother plant, which are drained to the fruit (seed) and stored in special structures (eg cotyledon), and that such been responsible for the nutrition of the seedlings during their first days of life, characterized by a critical stage of development. <br><br>So the best way to ensure an adequate level of nutrients in the seed is the application via the mother plant, especially for the high nutrient requirement by plants, N and K. Finally, it is observed that nitrogen alone does not affect seed germination, however, in some situations, you can change the fractions of proteins in grain and seed size. However, the N associated with potassium increases the effects on quality. In addition, adequate levels of other nutrients, like P, Ca and Mn were shown to be necessary due to gains in quality of seed. <br><br>STUDIES ON THE EFFECTS OF MINERAL NUTRITION OF PLANTS SEEDS AS A MATTER IN THE DIRECTION OF INCREASING THE EFFICIENCY OF THE RECOMMENDATION OF FERTILIZATION. <br><br>Nitrogen alone did not affect seed germination, however, in some situations, changes the fractions of proteins in grain and seed size. However, with the N associated with the potassium effects on quality are increased, and also adequate levels of other nutrients such as P, Ca and Mn, appear necessary, because the gains in quality of seeds are relevant. Potassium appears to be a nutrient with significant effects on seed quality, since even in the size effect. The supply of nutrients via the parent plant appears to be the best alternative to ensure the quality of seed, that with larger improve seedling development, however, not reflected in higher yields.