Potting media for physic nut (Jatropha curcas) seedlings grown under open and greenhouse conditions
2010
Perlas, F.B. | Alejo, R.R., Central Bicol State Univ. of Agriculture, Pili, Camarines Sur (Philippines)
The study was conducted to determine the effects of the potting medium on the growth of Jatropha seedlings, determine the relationship between the chemical properties of the potting media and the growth parameters of jatropha and compare effects of two light intensities on the growth of jatropha seedlings. The Completely Randomized Design (CRD) was used with six treatments replicated five times. The treatments were: T1=(Control) garden soil, T2=(1:1) garden soil, sawdust, T3=(1:1) garden soil, coco peat, T4=(1:1) garden soil, sand, T5=(1:1:1) garden soil, sand, mudpress, and T6=(1:1:1) garden soil,. sand, sawdust. The different potting media did not significantly affect the plant height of jatropha seedlings under open conditions at 14 and 42 days after transplanting. Significant difference in plant height was observed. The different potting media significantly affected the plant growth of jatropha seedlings only at 28 and 70 days after transplanting. The highest plant girth was observed in the garden soil + sand + sawdust treatment. Significant differences were observed in the leaf area in the open condition. Significant differences in plant height under green house conditions were observed after transplanting The garden soil + sand + mudpress treatment was observed to have the tallest seedlings, biggest plant girth and leaf area under green house conditions. Plant girth was significantly affected and was bigger under open conditions. The leaf area of jatropha seedlings was significantly affected by the two light intensities with bigger leaf area under green house conditions. Under open conditions, plant girth was significantly affected by organic matter content, total calcium and total magnesium, while leaf area was significantly affected by the total phosphorus content. The correlation coefficients between total calcium and total magnesium as well as between total phosphorus and leaf area were positive. The growth parameters such as plant girth, plant height and leaf area were not significantly affected by the chemical properties of the potting media under green house condition. A negative correlation coefficient was observed between organic matter content and the growth parameters.
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