Tanggap Fisiologi Akar Sorgum (Sorghum bicolor L. Moench) terhadap Cekaman Aluminium dan Defi siensi Fosfor di dalam Rhizotron

Karlin Agustina, Didy Sopandie, , Trikoesoemaningtyas, Desta Wirnas

Abstract


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A study on physiological mechanism of sorghum to aluminum (Al) toxicity and phosphorous (P) defi  ciencies was conducted using several sorghum genotypes in rhizotron. The study was conducted in the greenhouse of the University Farm, Bogor Agricultural University from August  to October 2009.  The experiment was carried out as a Factorial experiment in a Completely Randomized Design with three replications. The fi  rst  factor was sorghum genotypes consisted of Numbu (tolerant) and B-75 (sensitive), and the second factor was combination of lime and phosphorous  fertilization consisted of: no lime-no P (R1), no lime-low P (R2), no lime-suffi  cient P (R3), lime-no P (R4), lime-low P (R5) and lime-suffi  cient P (R6). The results showed that all  variables were signifi  cantly affected by the interaction of  media and genotype, except for length of shoot and total P uptake.  Under low P and Al toxicity, sorghum variety Numbu showed a higher nutrient effi  ciency than B-75 with ability of forming greater  dry mass. The sensitive genotypes showed a higher nutrient uptake but a lower P  nutrient use efficiency under   Al toxicity and P defi ciency.  Total P uptake and P nutrient use effi  ciency were highly correlated with root growth and dry material accumulation.

Keywords: sorghum, Al toxicity, P defi ciencies, P nutrient use effi ciency, P uptake

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DOI: http://dx.doi.org/10.24831/jai.v38i2.1791

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