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Growth and Nutrient Uptake Parameters in Sorghum as Influenced by Aluminum

USDA-ARS, Beckley, WV 25802-0867
USAID, S&T, AGR, AP, Washington, DC 20523-1809

H. L. Dos Santos, G. V. E. Pitta and A. F. De C. Bahia Filho

CNPMS/EMBRAPA, Caixa Postal 151-285, 35700 Sete Lagoas, MG, Brazil

^* Corresponding author.

Sorghum[Sorghum bicolor (L.) Moench] is the fifth most important cereal crop in the world. The majority of soils on which sorghum is grown are acidic, and production on such soils is limited by high levels of Al and Mn, and deficient levels of Ca, Mg, and P. A greenhouse experiment was conducted to evaluate differences in growth and uptake (U), influx (IN), and transport (TR) of nutrients by 40 sorghum genotypes at three levels of soil Al saturation. Growth of shoots and roots and nutrient uptake parameters were affected by soil Al saturation, genotypes, and their interactions. Growth and uptake parameters were used to separate the genotypes into most efficient and least efficient categories at various levels of soil Al saturation. Shoot nutrient U, IN, and TR were positively correlated (P < 0.01) with shoot and root dry weight, and inversely related (P < 0.01) to soil Al saturation and shoot Al concentration. Our greenhouse technique appears to be a reliable method for separating genotypesi nto Al-tolerant and intolerant types. Genotypes used in the study showed intraspecific genetic diversity in growth and uptake, influx, and transport of essential elements. Therefore, selection of acid-tolerant genotypes and further breeding of Al-tolerant cultivars is feasible in sorghum.

Received for publication May 13, 1992.

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