Leaf Litter Addition and Nutrient Recycling in Two Clones of Rubber (Hevea Brasiliensis Muell. Arg.) in Vellanikkara Estate
By: Sumadhan KN.
Contributor(s): Nazeem PA (Guide).
Material type:
BookPublisher: Vellanikkara Department of Plantation Crops and Spices, College of Horticulture 1993DDC classification: 633.8 Online resources: Click here to access online | Click here to access online Dissertation note: PG 1993 Abstract: The pattern of wintering, rate of litter fall, nutrient return through leaf litter and soil fertility status were investigated in two clones of rubber in Vellanikkara Estate of Kerala Agricultural University. The wintering started by mid November and was earlier in RRII 105 than in RRII 118 and ended by last week of February. The peak period of defoliation for RRII 105 was in the 2nd fortnight of January, whereas for RRII 118 it was maximum in the 1st fortnight of February. The total leaf litter production by RRII 105 and RRII 118 was estimated to be 3926 kg and 2992 kg ha-1 yr-1 respectively. The recycling of major nutrients through leaf litter was higher in RRII 105 (N:69 kg/ha, P: 4 kg/ha, K : 48 kg/ha, Ca: 52 kg/ha and Mg: 14 kg/ha) than in RRII 118 (N : 44 kg/ha, P : 3 kg/ha, K: 29 kg/ha, Ca: 49 kg/ha and Mg: 11 kg/ha). In both the clones the percentage of N, P and K retained in the leaf litter was found to be increased suddenly by the end of December and then decreased till the end of wintering. The rate of depletion of nutrients in the litter removed area was higher than the litter deposited area. The nutrient depletion was not much pronounced in litter deposited area since the nutrient removal for crop growth might be compensated by the nutrients released from the litter on decomposition. The rate of depletion was high in 0 to15 cm depth of the soil and was negligible in 30 to 60 cm depth. Leaf area index was estimated to be 7.27 and 6.07 for the clones RRII 105 and RRII 118 respectively. The higher leaf area index would be the major contributing factor for the increased litter production and better yield potential exhibited by the clone RRII 105.
| Item type | Current location | Call number | Status | Date due | Barcode |
|---|---|---|---|---|---|
Theses
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KAU Central Library, Thrissur Theses | 633.8 SUM/LE (Browse shelf) | Available | 170497 |
PG 1993
The pattern of wintering, rate of litter fall, nutrient return through leaf litter and soil fertility status were investigated in two clones of rubber in Vellanikkara Estate of Kerala Agricultural University. The wintering started by mid November and was earlier in RRII 105 than in RRII 118 and ended by last week of February. The peak period of defoliation for RRII 105 was in the 2nd fortnight of January, whereas for RRII 118 it was maximum in the 1st fortnight of February. The total leaf litter production by RRII 105 and RRII 118 was estimated to be 3926 kg and 2992 kg ha-1 yr-1 respectively. The recycling of major nutrients through leaf litter was higher in RRII 105 (N:69 kg/ha, P: 4 kg/ha, K : 48 kg/ha, Ca: 52 kg/ha and Mg: 14 kg/ha) than in RRII 118 (N : 44 kg/ha, P : 3 kg/ha, K: 29 kg/ha, Ca: 49 kg/ha and Mg: 11 kg/ha). In both the clones the percentage of N, P and K retained in the leaf litter was found to be increased suddenly by the end of December and then decreased till the end of wintering. The rate of depletion of nutrients in the litter removed area was higher than the litter deposited area. The nutrient depletion was not much pronounced in litter deposited area since the nutrient removal for crop growth might be compensated by the nutrients released from the litter on decomposition. The rate of depletion was high in 0 to15 cm depth of the soil and was negligible in 30 to 60 cm depth. Leaf area index was estimated to be 7.27 and 6.07 for the clones RRII 105 and RRII 118 respectively. The higher leaf area index would be the major contributing factor for the increased litter production and better yield potential exhibited by the clone RRII 105.
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