ASSESSMENT OF CARBON POOLS AND MICROBIAL DYNAMICS UNDER NAGPUR MANDARIN IN SEMIARID REGION OF CENTRAL INDIA.
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Date
2019-08-31
Authors
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Dr. Punjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present investigation entitled "ASSESSMENT OF CARBON POOLS AND MICROBIAL DYNAMICS UNDER NAGPUR MANDARIN IN SEMIARID REGION OF CENTRAL INDIA” was carried out during 2018-19. 12 locations of Nagpur mandarin orchard (6 each of Nagpur and Wardha district) were selected. 12 composite soil samples (1 each of location) were collected at 0-30 cm depth for determine the chemical, biological properties and carbon pools of soil. For determine periodical propagule count (cfu g-1 of soil) of Phytophthora spp. 6 locations selected from Nagpur district, 30 soil samples were collected at 0-20 cm depth (5 soil samples from each location) periodically in the month of October, December-2018 and February-2019.
From the data, the results revealed that, soil reaction of study area exhibited neutral to slightly alkaline in nature (Soil pH-7.37 to 8.17). In all locations, there was no much variations in electrical conductivity of soil and found non-saline in nature (0.24 to 0.43 dS m-1). The calcium carbonate in soil recorded from 2.90 to 4.10 per cent resulted under moderately calcareous in nature. The values of soil organic carbon (5.80 to 7.70 g kg-1) observed under medium to moderately high.Soils under study area were low in available nitrogen and available phosphorus in soils found low to moderately high (13.44 to 21.28 kg ha-1). All the soils under investigation were found very high in available potassium.
The maximum microbial count was recorded in locations where more organic inputs applied compared to other, the count of bacteria, fungi and actinomycetes were varied from 14.13 to 21.93. X 107 cfu g-1, 10.33 to 13.66 X 105 cfu g-1 and 4.33 to 7.66 X 105 cfu g-1 respectively. The total of very labile and labile carbon fractions varied from 1.65 to 3.62 g kg-1 under different management practices which contribute 22.32 to 37.47 per cent of TOC whereas, the total value of passive pool comprises LLC and NLC varied from 5.69 to 6.54 g kg-1 which constitute 62.52 to 77.67 per cent of TOC. The contribution of carbon pools was in order non labile C (61.98%) > very labile C (18.80%) > labile C (11.08%) > less labile C (8.13%). Propagule counts of Phytophthora spp. varied from 20.00 to 34.20 cfu g-1 of soil amongst October, December-2018 and February-2019 months. Higher cfu g-1 of soil was recorded in month of December (29.66) as compared to October (27.20) and February (22.40). Positively significant correlation was recorded between intensity of Phytophthora with the soil pH (r=0.536*) and (r=0.409**), EC (r=0.447**) and (r=0.740*), Available K (r=0.439**) and (r=0.436**) and calcium carbonate (r=0.709*) and (r=0.422**), respectively in the month of October and December, 2018.
The highest fruit yield of Nagpur mandarin (22 t ha-1) was obtained at location Dhanodi with the continuous application of fertilizers (300:100:125 g NPK + 40 kg FYM per tree with age of 12 years Nagpur mandarin. From the study, it can be concluded that, the active pool is an important fraction which maintained the chemical and biological productivity of soil, however, the balanced amount of inorganic nutrients and sufficient quantity of FYM per tree is needed to soil sustainability and fruit yield of Nagpur mandarin, with the age of above 10 years.
Description
The soil samples were collected from Ghogali, Savali parbat, Borgaon, Pardi, Parsodi and Indora villages of Nagpur district and Chistur, Dhanodi, Savangi, Pimpalgaon and Talegaon villeges of Wardha district to assess soil carbon pools, to study chemical properties of soil and to find out periodical distribution of Phytophthora spp. after analysis the result were found that the soils pH were neutral to slightly alkaline and non saline. The macronutrients N was low, P was low to moderately high and K was very high in range. The maximum microbial count was recorded in locations where more organic inputs applied compared to other. The contribution of carbon pools was in order non labile C > very labile C > labile C > less labile C. Higher cfu g-1 of Phytophthora spp. in soil was recorded in month of December (29.66) as compared to October (27.20) and February (22.40). Positively significant correlation was recorded between intensity of Phytophthora with the soil pH, EC, Available K and calcium carbonate in the month of October and December, 2018.
Keywords
Soil Science and Microbiology, Soil Sciences, Soil Properties, Soil Micro-Organisms, Soil Analysis.
Citation
JAYBHAYE, YOGESH SHIVANAND. (2019). Assessment of carbon pools and microbial dynamics under Nagpur mandarin in semiarid region of central India. Department of soil science and agricultural chemistry, Nagpur. Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xii, 63p. (unpublished).