Vol. 6, Issue 3 (2018)
Forms of boron under different cropping systems in soils of Morigaon district of Assam
Author(s): Nath DC, Talukdar MC, Chowdhury Pulakabha, Deka Kanku and Talukdar Bidyasagar
Abstract: Boron is directly or indirectly involved in several physiological and biochemical processes during plant growth. Hundred numbers (100) of surface (0-15 cm) soil samples from different cropping systems were collected with an auger from Morigaon district (between longitude (92° and 95.5°E) latitude, (26.15° and 26.5°N) representing twenty five (25) soil samples from each dominant cropping systems. Soil samples were analyzed to determine the forms of boron under different cropping systems in Inceptisols soils of Morigaon district and its relation to soil properties. The experimental findings revealed that the soils were sandy loam to silty clay loam in texture and strongly acidic to near neutral (4.17 to 6.94) in reaction with organic carbon content ranging from medium to high (0.51 to 1.14 per cent). EC of the soils were very low ranging from 0.01 to 0.06 dS m-1. The CEC of the soils were low and varied from 5.50 to 7.70 [cmol (p+) kg-1]. The available nitrogen, phosphorus and potassium content of the soil ranged from low to medium (219.52 to 533.12 kg/ha), (21.54 to 57.96 kg/ha) and low to high (104.36 to 419.46 kg/ha). The sequential extraction of boron showed that forms of boron followed the decreasing order as: Res-B > Ox-B > Org-B > SA-B > RS-B and per cent distribution of different forms were also in the same order as: 42.71% > 25.50% > 24.97% > 3.28% > 2.60% of the total. Statistically, RS-B fraction was positively correlated with organic carbon and Org-B of the soil under rice-rice and rice-rapeseed cropping system. It also showed a positive correlationship with organic carbon, Org-B and Res-B fraction of the soil in rice-vegetable and vegetable-vegetable cropping system. The SA-B showed a positively relationship with Ox-B fraction of the soil in rice-rapeseed cropping system. Ox-B fraction had a positive correlation with Org-B fraction of the soil in rice-rice and rice-rapeseed and rice-vegetable cropping systems. Similarly, Org-B fraction of the soil in all the cropping systems was positively correlated with organic carbon and Ox-B fraction of the soil. Res-B fraction showed positive correlationship with RS-B fraction of the soil in rice-rapeseed, rice-vegetable and vegetable-vegetable cropping system. EC: Electrical Conductivity, CEC: Cation Exchange Capacity, RS-B: Readily Soluble Boron, SA-B: Specifically Adsorbed Boron, Ox-B: Oxide Bound Boron, Org-B: Organically Bound Boron, Res-B: Residual Boron
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How to cite this article:
Nath DC, Talukdar MC, Chowdhury Pulakabha, Deka Kanku, Talukdar Bidyasagar. Forms of boron under different cropping systems in soils of Morigaon district of Assam. Int J Chem Stud 2018;6(3):1161-1166.
