Open AccessSoil fertility evaluation of rice soils of Lumbajong block of Karbi Anglong district under hill zone of Assam through nutrient indexing
Author(s) -
N. Kalita,
Subal Maibangsa
Publication year - 2020
Publication title -
asian journal of soil science/asian journal of soil science
Language(s) - English
Resource type - Journals
eISSN - 0976-7231
pISSN - 0973-4775
DOI - 10.15740/has/ajss/15.2/81-85
Subject(s) - soil water , soil fertility , nutrient , total organic carbon , agronomy , environmental science , manure , soil carbon , soil ph , soil test , biology , soil science , ecology
The Lumbajong block of Karbi Anglong district of Assam is characterized by undulating topography comprising of hillocks and lowland paddy fields. Cultivation of rice in traditional ways for years without adequate and balanced use of chemical fertilizers and with little or no use of organic manure have caused severe fertility deterioration resulting in stagnating or even declining productivity of the paddy field soils. Spatial distributions for organic carbon, available N, available P and available K were examined in the soil samples of selected rice fields in 102 different locations covering six villages in the block to evaluate the fertility status of the block. The study revealed that there is much variation in soil fertility status of soils developed on various land forms in the area as the soils were having low to high in organic carbon (0.42 to1.12 %), low to medium in available nitrogen (175.62 to 376 kg/ha) content; low in available P (3.86 to 28.29 kg/ha) and low to high in available K (71.68 – 439.04 kg/ha) contents. The soils of Lumbajong block were characterized as medium-medium-low-medium (MMLM) category based on the nutrient index calculated with respect to organic carbon, available N, available P and available K.