Effect of pig manure extract as foliar application on plant growth, chlorophyll contents, leaf expansion and yield of cassava (Manihot esculenta Cranz) cv. Hauybong 60
2009
Kanto, U. | Jutamanee, K. | Jattupornpong, S.
Pig manure is a problematic farm waste but containing all nutrients required by plants. This study sought to utilize pig manure extract (PME) as a source of nutrient for cassava production. The plants were subjected to five treatments as follows: 1. No fertilizer, 2. Chemical fertilizer 21-10-10 at 40 kg/rai applied at 45 days after planting, 3. Foliar application of PME, 4. Soil application of PME and 5. Foliar and soil application of PME. PME as foliar or soil application was done every month from 45 until 245 days after planting and harvested after 10 months. The plants with foliar and soil application of PME had the highest yield of 12.73 ton/rai. Chlorophyll contents in all fertilizer applications decreased in the first 4 months, increased until 6 months and decreased again at 8 months after planting. There were significant differences in chlorophyll a, chlorophyll b and total chlorophyll content at 4 months after planting where foliar and soil application of PME showed the highest chlorophyll contents. Leaf expansion (LAI) gradually increased from 3 to 6 months after planting but was reduced after 6 months due to the reduction of leaf canopy except those on chemical fertilizer application. There were no significant difference in plant height and stem diameter of the plants. Soil and foliar applications of PME provided higher starch content of roots. The difference in soil strength was 39%. The higher yield always found in the low soil strength plots. The application of PME as a soil and foliar fertilizer could provide higher roots yield than chemical fertilizer application.
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