Sulphur Use Efficiency in Soybean Cultivars Adapted to Tropical and Subtropical Conditions.

Sulphur (S) is an essential nutrient in crop plants because it is one of the components of aminoacids (AAs) and proteins. Studies about sulphur efficiency on soybean cultivars [Glycine max (L) Merril] adapted to the tropical and subtropical conditions are still incipient. In Brazil, one experiment under greenhouse conditions evaluated the S-efficiency from eight soybean cultivars. The plants cultivated in a Typic Quartzipsamment received two S rates (0 and 80 mg kg-1). The grain yield (GY), shoot dry weight (SDW), and the relative yield (RY) had influence from the S rates. The cultivars BRS 295RR and BRS 360RR were the most efficient in using the S application. The number of pods per plant (NPP), photosynthetic rate (A), nitrate reductase (N-NO2-) and chlorophyll significantly increased with de 80 mg kg-1 of S. By contrast, the internal concentration of CO2 (Ci) was reduced. Similarly, there were increases in the concentration of N, P, Mg, and N:S ratio in the leaves and grain, but the K increased only in the leaves. Comparing the cultivars, only the N concentration in the leaves and the Mg in the grain had non-significant differences.

Abstracts:

• Sulphur.txt (0.0KB) - Abstract