Dry matter partitioning in potato genotypes under organic production in the Philippine highlands
2009
Simongo, D.K. | Tad-Awan, B.A.
Genotypes CIP 380251.17, CIP 13.1.1 and PHIL 5.19.2.2 were the best performers in terms of leaf area index, net assimilation rate and crop growth rate. Assimilates partitioned into leaves, stems, roots, stolons and tubers at 45, 60, 75 and 90 DAP differed among genotypes and at different stages of development. Among the plant organs, the roots and stolons had the highest dry matter contents in genotype PHIL 5.19.2.2 at 45,60 and 75 DAP. Assimilates partitioned in tubers increased in most of the genotypes at 75 DAP and decreased at 90 DAP except in genotypes 380251.17 and PHIL 5.19.2.2. Genotypes PHIL 5.19.2.2, CIP 13.1.1 and CIP 96-06 had the highest total yield of 4.57, 4.21 kg and 4.13 kg, respectively and computed marketable yields of 6.33, 5.46 and 5.92 tons/ha. Correlation analysis revealed positive significant correlations in dry matter content of leaves with sunshine duration in Granola, dry matter content of stems with rainfall in genotypes CIP 380251.17 and with maximum temperature in genotype CIP 573275. Significant negative correlations were observed in crop growth rate with rainfall in genotyopes CIP 13.1.1 and PHIL 5.19.2.2, and leaf area index with minimum temperature. Among the characters, positive correlations is net assimilation rate with extra large tubers were observed. Highly significant positive correlations were observed between net assimilation rate and crop growth rate.
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