Magnesium as a Promoter of Technological Quality in Sugarcane

Abstract

The aim of the present study was to evaluate the effect of magnesium (Mg 2+) supply on the nutritional status and carbohydrate partitioning of sugarcane plants. The treatments consisted of two Mg 2+ levels in nutrient solution (2 mg L −1 and 10 mg L −1). The following parameters were evaluated: leaf chlorophyll content, root morphological parameters, dry matter partition, nutritional composition, partition of carbohydrates, and soluble sugars. All plant growth parameters were influenced by Mg 2+ concentrations, except stalk dry matter. Regarding the dry matter apportioning, Mg control plants presented higher dry matter in leaves than those under Mg deficiency. Plants malnourished with Mg presented higher concentration of K + but not total dry matter accumulation. In addition, photosynthetic pigments production was lowered by Mg deficiency. The concentration of reducing sugars in leaves or roots were not affected by magnesium levels. However, in the stalks, the sucrose concentration was higher in Mg 2+ well-nourished plants. Although the dry matter in stalks was not affected by Mg supply, Mg control plants had higher sucrose accumulation in stalks compared to Mg-deficient. Therefore, Mg fertilization seems to be a key to increase sugar yield in sugarcane fields, mainly in those with high K input.

Dynamics of Macronutrient Uptake and Removal by Modern Peanut Cultivars

“…The differences among peanut cultivars for leaf contents of K, Ca and Mg can be explained by the genotypic variation of these materials. In addition, the highest leaf K contents in the cultivars IAC Runner and IAC 505 reflected in the lowest Mg contents in these same cultivars, as there is an antagonism between K and Mg in plants [18]. However, all cultivars presented leaf contents of macronutrients considered adequate for peanuts (N: 30 to 45 g kg −1 ; P: 2.0 to 5.0 g kg −1 ; K: 17 to 30 g kg −1 ; Ca: 12 to 20 g kg −1 ; Mg: 3.0 to 8.0 g kg −1 and S: 2.0 to 3.5 g kg −1 ) [12].…”

Agricultura irrigada no Brasil: inovação, empreendedorismo e sistemas de produção

“…Sugere-se atenção para adubações nitrogenadas quando restar menos de 5 meses para a colheita, dado que ela pode inibir a concentração de açúcar no colmo (MEGDA et al, 2012;SCHULTZ et al, 2015). Em contrapartida, aumentar a oferta de potássio, boro e magnésio colaboram para a maturação da cana (OTTO et al, 2010;CRUSCIOL et al, 2017;GARCIA et al, 2020).…”

Predictive Models of Chlorophyll Content in Sugarcane Seedlings Using Spectral Images

“…Three leaf samples were randomly taken from each row or table plot (only one cultivar) for analysis by the "leaf +1" diagnostic method, as recommended by Garcia et al, 2020. The analysis was performed for each cultivar in each fertigation dose, resulting in 36 samples per day and 144 samples throughout the experiment.…”

“…Aiming to maintain quality standards and aid decision-making, producers have used several biometric measurements of sugarcane as indicators of plant vigor, nutritive status, and seedling quality (Garcia et al, 2020;Oliver & Silva, 2018). Seedling chlorophyll contents provide subsidies for fertilization, especially pre-sprouted seedlings.…”