Soil fertility status and nutrient index for primary nutrients in Western Ghats and Coastal Karnataka under different agro-ecological systems

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.

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Soil Fertility Status and Nutrient Index in Different Tasar Silkworm Host Plants Growing Ecosystems of Purulia District, West Bengal, India

International Research Journal of Pure and Applied Chemistry ◽

10.9734/irjpac/2020/v21i130147 ◽

2020 ◽

pp. 28-35

Author(s):

T. Pandiaraj ◽

Susmita Das ◽

Manjappa . ◽

Alok Sahay

Keyword(s):

Soil Fertility ◽

Host Plants ◽

West Bengal ◽

Soil Reaction ◽

Available Phosphorus ◽

Available Nitrogen ◽

Fertility Status ◽

Nutrient Index ◽

Purulia District ◽

Soil Fertility Status

This study was conducted to evaluate soil fertility status in the fourteen major tasar sericulture adopting villages in Purulia District, West Bengal. For this, a total of 160 surface soil samples (0-30 cm) were collected from dominant tasar sericulture villages along with the details regarding farmer’s name, soil type, host plants details, etc. The collected samples were air dried, sieved and analysed for various soil fertility parameters such as pH, EC, organic carbon, macro and micronutrients. The data on various parameters were categorized into low, medium and high classes based on soil fertility ratings and nutrient index was calculated. Results revealed that soil reaction in the study area varied from strongly acidic to moderately acidic with saline free soil. The available nitrogen was low level in all the tasar host plant growing regions. In all the study regions, medium range of available phosphorus, potassium and sulphur was observed. All the micronutrients were high in the study villages. Regard NIV, all the macronutrients except nitrogen showed medium nutrient index in most places. Fertility rate of available micro nutrients were high index in all the tasar growing villages.

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Assessment of Soil Fertility Status Using Nutrient Index Approach in Cassava Farms of Rewa Province, Fiji

Indian Journal of Agricultural Research ◽

10.18805/ijare.af-680 ◽

2021 ◽

Author(s):

H.K. Sachan ◽

Deeksha Krishna

Keyword(s):

Organic Carbon ◽

Soil Fertility ◽

Management Strategies ◽

Available Phosphorus ◽

Fertility Status ◽

Index Approach ◽

Nutrient Index ◽

Calcium And Magnesium ◽

Soil Fertility Status ◽

Index Value

Background: Nutrient index methods and fertility indicators can be used to determine the fertility status of soils. The information can be used to develop soil management strategies for farmers. Methods: The research was conducted in the Rewa district of Fiji, with an aim to assess soil fertility status using the nutrient index approach. A total of 57 cassava-growing farms were selected from three sub-districts of Rewa province for the present investigation and collected soil samples were analyzed in accordance with standard procedures for evaluating chemical parameters and the status of available nutrients in the soil. Result: The study discovered that the soils of farms are acidic in reaction, have low levels of organic carbon, low to moderate levels of major primary nutrients, however, the soils had a high content of calcium and magnesium. The soil nutrient index value calculated of soil organic carbon and available phosphorus were recorded as low with 1.48 and 1.40 respectively. The NIV for nitrogen and potassium content was medium category values of 1.91 and 1.95, respectively. The nutrient index value calculated for exchangeable calcium and magnesium content was recorded as high with 2.75 and 2.35 values respectively.

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Assessment of Soil Fertility Status Using Nutrient Index Approach of Ovu Sub-Clan, Delta State, Nigeria

Agricultural Science Digest - A Research Journal ◽

10.18805/ag.d-294 ◽

2020 ◽

Author(s):

S.A. Ojobor ◽

C.N. Egbuchua ◽

R.A. Onoriasakpovwa

Keyword(s):

Organic Carbon ◽

Soil Fertility ◽

Total Nitrogen ◽

Soil Ph ◽

Oil Palm ◽

Phosphorus Content ◽

Available Phosphorus ◽

Fertility Status ◽

Nutrient Index ◽

Soil Fertility Status

Background: Amendment of soil fertility through regular nutrient assessment is a necessary intervention for sustainable crop production. Ovu, is a sub-clan in Delta State, Nigeria which comprised of: Ovu-Inland, Okoemaka, Ekpan, Urhodo, Okoroke and Oviorie that are mostly farmers without the knowledge of their soil fertility. The study investigated soil fertility status of Ovu Sub-Clan. Methods: Cassava, oil palm and plantain farms were randomly selected in the six community and 118 representative soil samples were taken. Soil pH, organic carbon, total nitrogen, available phosphorus content of soil and exchangeable bases were measured. Data were analyzed with descriptive statistics and Parker’s nutrient index was used to compare the fertility level. Result: The cassava, oil palm and plantain farms were slightly acidic mean values of 6.4±0.38, 6.5±0.31 and 6.4±0.30, respectively indicating slight acidity. Organic carbon was low to high while total nitrogen was high except at Okoemaka that was moderate (0.19±0.04%). Available phosphorus content was low to medium while exchangeable potassium and calcium were medium to high, exchangeable magnesium was low to medium. Nutrient index showed that soil pH was moderate and while total nitrogen was high.

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