BIOMEDIATED NUTRIENT TRANSFORMATION IN THE RHIZOSPHERE OF NURSERY FRUIT PLANTS
Loading...
Date
2015
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu
Abstract
A pot culture experiment was conducted during 2008 with six fruit nursery plants of (guava, aonla, ber, mango, kinnow and orange) and during 2009 with four fruit nursery plants (strawberry, peach, plum and pear) as test crops. The six number of treatments viz., T<sub>1</sub> (Control), T<sub>2</sub> (FYM @ 250 g/10 kg soil), T<sub>3</sub> (Compost @ 200 g/10 kg of soil), T<sub>4</sub> (Recommended N, P, K), T<sub>5</sub> (Vermicompost @ 160 g / 10 kg soil), and T<sub>6</sub> (PSB + NS nitrogen fixer @ 3 g/10 kg soil) were taken into consideration each treatment having three replications. The treatment effect was monitored in the rhizosphere soils of fruit nurseries at 30, 60, 90 and 120 days interval in terms of total number of bacterial and fungal populations, urease enzyme activity, phosphatase enzyme activity, sulphatase enzyme activity, mineral nifrogen, organic nifrogen, available phosphorus, organic phosphorus, mineral sulphur, organic sulphur. The nutrient content in the leaf was recorded at 120 days after plantation. Out of the ten fruit plants, the maximum bacterial population of the order of 63 cfu x10<sup>5</sup> was recorded in mango rhizosphere with the treatment (T<sub>6</sub>) i.e. non-symbiotic N<sub>2</sub> fixers + PSB at 90 days of plant growth and minimum bacterial population was found in the rhizosphere of Orange in Control (24 cfu x10<sup>5</sup>) and the overall treatment effect follows the order: PSB + NS N-fixers > vermicompost > compost > FYM > NPK > control; whereas in case of total fiingal population the rhizosphere of Mango and Strawberry each exhibited highest fungal population of 31 cfu x 10<sup>3</sup> at 90 days whereas the lowest fungal population was found in the rhizosphere of Pear in control (5 cfu x 10<sup>3</sup>) and the order with regard to the total fungal population was: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control. The maximum urease activity was recorded at 90 days in rhizosphere of Plum (24.2 mgNH<sub>4</sub>N kg<sup>-1</sup> soil h<sup>-1</sup>) with the vermicompost and with the minimum urease enzyme activity in Control in the Mango rhizosphere at 30 days with the urease activity of 9.9 mgNH<sub>4</sub>Nkg<sup>-1<sup> soil h<sup>-1</sup> and the order was: Vermicompost
> PSB + NS N-fixer > compost > FYM > NPK > control. The phosphatase enzyme activity was found in the soils freated with Non Symbiotic N<sub>2</sub> fixers + PSB (T<sub>6</sub>) exhibited maximum phosphatase enzyme activity in rhizosphere of Mango (137.2 mg p-nifrophenylphosphate g<sup>-1</sup> soil h<sup>-1</sup>) and minimum phosphatase activity was exhibited in confrol in the rhizosphere of Ber at 30 days with the phosphatase activity of 83.6 mg pnitrophenylphosphate g<sup>-1</sup> soil h<sup>-1</sup> and the order was: PSB + NS N-fixers > vermicompost > compost > FYM > NPK > control. The sulphatase enzyme activity was found to increase from 30 days to 90 days and soils treated with Vermicompost (T<sub>5</sub>) exhibited maximum sulphatase enzyme activity in the rhizosphere of Aonla (130.2 mg p-nitrophenylsulphate g<sup>-1</sup> soil h<sup>-1</sup> ) and minimum sulphatase activity was found in control in the rhizosphere of Plum at 30 days with the sulphatase activity of 67.4 mg p-nitrophenylsulphate g<sup>-1</sup>soil h<sup>-1</sup> and the order was: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control. The mineral nitrogen content was observed to be higher with the Vermicompost treatment (T<sub>5</sub>)in the rhizosphere of Kinnow exhibiting high mineral nitrogen content (69.4 mg/kg) whereas the minimum mineral nitrogen content was found inthe rhizosphere of Guava (23.1 mg/kg) and the order was: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control.The total hydrolysable nitrogen content was observed to be higher with the Vermicompost treatment (T<sub>5</sub>) and increased from 30 days to 120 days in all the treatments. The rhizosphere of Mango showed maximum total hydrolysable nitrogen content (234.3 mg/kg) treated with Vermicompost (T<sub>5</sub>) and minimum was observed in control in the rhizosphere of Aonla (159.3mg/kg) following the order: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control. The hydrolysable nitrogen content was observed to be higher with the Vermicompost treatment (T<sub>5</sub>) and it increased from 30 days to 120 days in all the treatments. The rhizosphere of Mango showed highest hydrolysable nitrogen content (147.5mg/kg) and lowest hydrolysable nitrogen was observed in control in the rhizosphere of Guava (94.1 mg/kg) and Peach (94.1mg/kg).and the order was: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control.The highest non- hydrolysable nitrogen content was observed in control and increased from 30 days to 120 days in all the treatments. The rhizosphere of Aonla showed maximum non hydrolysable nitrogen content (102.6 mg/kg) in control while as the minimum non-hydrolysable nitrogen was found in rhizosphere of Ber in Non Symbiotic N<sub>2</sub> fixers + PSB (T<sub>6</sub>) and the order was: Vermicompost > PSB + NS N-fixer > compost > FYM > NPK > control.
Description
Keywords
null
Citation
No. of references 495