SILICON INDICES AND THEIR RELATIONSHIP WITH BASIC SOIL PROPERTIES IN RICE GROWING SOILS OF JAMMU PLAINS
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Date
2021-02
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Sher-e-Kashmir University of Agricultural Sciences and Technology Jammu, J&K
Abstract
Silicon (Si) is a beneficial element which influences the growth, development and yield of many crop plants especially rice. Rice is known as silicon accumulating plant because of its high requirement which contains Si at levels up to 10 % of dry matter weight. Since optimum crop production depends on the maintenance of adequate plant nutrients in the soil, there is a need for a reliable index for assessing the requirement for supplemental Si in soils, particularly growing rice. A study was conducted to assess Si availability in rice growing soils of Jammu plains to select a suitable Si extraction method. For this purpose, surface soil samples (0-15 cm) from 140 locations of three major rice growing districts of Jammu plains viz., Jammu, Samba and Kathua were collected and analysed for various physico-chemical properties and available Si content. The extractants used for extracting plant available Si were 0.01M calcium chloride (CaCl2), 0.5M ammonium acetate (NH4OAc) and 0.5M acetic acid. The results revealed that the textural class of soils was sandy loam to sandy clay. The soils were moderately acidic to moderately alkaline in reaction with limited salt content. Soil organic carbon, available phosphorus, available potassium and available sulphur content varied from low to high and the available nitrogen content in soils varied from low to medium in three districts. However, amongst the three districts, highest mean OC content (7.04 g kg1) was observed in Jammu district and lowest in Samba district (5.66 g kg1). In respect of macronutrients, highest mean value of available N (293.2 kg ha-1) and K content (201.9 kg ha-1) were found in Kathua district whereas highest mean value of P (25.1 kg ha-1) and S content (18.1 mg kg-1) were found in Jammu district. Extraction pool of available Si was found maximum by 0.5 M acetic acid followed by 0.5M NH4OAc and least by 0.01M CaCl2.The plant available Si content (mg kg-1) in soils extracted by 0.01M CaCl2, 0.5M NH4OAc and 0.5M acetic acid ranged from 10.1 to 632.0, 14.0 to 752.0 and 84.0 to 884.3 mg kg-1, respectively with the mean content of 227.6, 321.9 and 472.5 mg kg-1 in Jammu district. However, soils of Kathua district contain lower mean values than Jammu district which were 261.7, 376.6 and 536.9 mg kg-1 and soils of Samba district contain lowest mean values of 226.0, 287.4 and 428.5 mg kg-1, respectively which were found to be sufficient, except very few samples which contain low available silicon. The available Si content extracted with different extractants showed negative relationship with sand content and positive relationship with pH, clay content, OC, CEC, available N, available P and available K content of the soil in three districts.
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Preferred for your work_ Silicon Indices and their Relationship with Basic Soil Properties in Rice Growing Soils of Jammu Plains, Division of Soil Science and Agriculture Chemistry (2020).