ASSESSMENT OF DECOMPOSITION POTENTIAL OF ORGANIC RESIDUES FOR CARBON AND NUTRIENT MINERALIZATION.
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Date
2019-08-01
Authors
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Publisher
Dr. Punjabrao Deshmukh Krishi Vidyapeeth, Akola, Maharashtra.
Abstract
The present study was undertaken to investigate “Assessment of decomposition potential of organic residues for carbon and nutrient mineralization” during the year 2018-19 at soil science and agricultural chemistry section, College of Agriculture, Nagpur. The experiment was laid out in completely randomized design (CRD) with nine treatments replicated thrice. The treatments were absolute control in T1, cow dung mixture in T2, paddy straw in T3, wheat straw in T4, sugarcane trash in T5, gliricidia lopping in T6, subabul leaves in T7, soybean stalks in T8, green gram stalks in T9. Among the organic residue samples used for the present study, soybean stalks mixture was highest in organic carbon i.e., 51.1 per cent, whereas, subabul leaves recorded maximum nitrogen (3.20%) and sulphur (0.18%). P and K were highest in green gram stalks mixture with the values 0.53 and 3.20 per cent, respectively. Initial properties of experimental soil revealed that the soil was low in OC
(4.9 g kg-1) low in available N and P and high in available K. Sulphur content of soil was 12.80 kg ha-1. Regarding nutrient mineralization, it was observed that, control pot recorded least N, P and S mineralization whereas, subabul leaves mixture (T7) recorded maximum ammoniacal nitrogen (48.98 mg kg-1, 52.66 mg kg-1, 56.99 mg kg-1 and 44.99 mg kg-1) and nitrate nitrogen (26.25 mg kg-1,
38.02 mg kg-1, 30.01 mg kg-1 and 20.83 mg kg-1) throughout experimentation. Gliricidia lopping mixture ranked 1st by recording maximum P mineralization for 30 (6.99 mg kg-1), 60 (7.33 mg kg-1), 90 (7.55 mg kg-1) and 120 (7.45 mg kg-1) days of experimentation. Sulphur mineralization was also found highest in T6 by application of gliricidia lopping mixture during experimentation. Maximum CO2 evolution was recorded in green gram stalks (T9) and lowest was found in control pot. Maximum value (7.53) for pH was recorded in control and paddy straw mixture recorded lowest (7.21) pH value. EC was also found highest in paddy straw. Soybean stalk mixture (T8) recorded 5.92 g kg-1 which was highest among all treatments. Availability of nutrients was found more in legume residue. Subabul leaves mixture (T7) increase availability of N upto 170.49 kg ha-1 whereas, gliricidia lopping mixture (T6) recorded highest available phosphorus (16.69 kg ha-1) and available sulphur
(14.27 kg ha-1). Highest potassium (395.27 kg ha-1) was recorded in green gram stalks mixture (T9). Microbial population was also found highest in legume residue. Gliricidia lopping mixture (T6) recorded 15.33 x 104 cfu g-1 while, subabul leaves mixture recorded highest bacterial count (22.33 x 106 cfu g-1) and highest count for actinomycetes (13.33 x 104 cfu g-1).
Description
It relates to the decomposition rate and N, P, S mineralization of different treatments (organic residues) applied to the soil. Among all other treatments, legume residues showed highest mineralization of carbon and nutrients.
Keywords
Soil Science and Microbiology, Soil sciences, Organic Amendments.
Citation
PATEL, KU. JAGRITI. (2019). Assessment of decomposition potential of organic residues for carbon and nutrient mineralization. Department of soil science and agricultural chemistry, Nagpur. Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xi, 94p. (unpublished).