Temporal Variation in Micronutrient Content in Soil Amended with Thermochemical Organic Fertilizer Prepared from Different Reagent Combinations
Greeshma P R
Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala, India.
Naveen Leno *
Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala, India.
Rani B
Department of Soil Science and Agricultural Chemistry, College of Agriculture, Vellayani, Thiruvananthapuram, Kerala, India.
G. Byju
ICAR-CTCRI, Sreekaryam, Thiruvananthapuram, Kerala, India.
Sheeba Rebecca Isaac
RARS Kumarakom, Kerala Agricultural University, Kerala, India.
Gladis R
ARS, Thiruvalla, Kerala, India.
*Author to whom correspondence should be addressed.
Abstract
A laboratory incubation study was carried out in the Department of Soil Science and Agricultural Chemistry, for 90 days to assess the dynamics of micronutrient release from Thermochemical Organic Fertilizer (TOF) prepared using different reagent combinations. Two kg air dried 2 mm sieved soil was taken in 3 kg container pots. The study was laid in Completely Randomized Design with 6 treatments and 3 replications. Treatments were, T1: FYM @20 t ha-1; T2:TOF prepared from 5% acetic acid and 10 % Calcium hydroxide [TA5CH10]; T3: TOF prepared from 5% acetic acid and 15 % Calcium hydroxide [TA5CH15]; T4: TOF prepared from 10% acetic acid and 10 % Calcium hydroxide [TA10CH10]; T5:Patented TOF and T6: Control (Soil alone). Fe, Mn Zn and B exhibited a gradual and progressive release pattern throughout the incubation period. Whereas Copper (Cu) availability showed a decreasing trend from the 30th day onwards. Hence it can concluded that TOF significantly improved the micronutrient availability in soil compared to the FYM based and control treatment.
Keywords: Thermochemical organic fertilizer (TOF), nutrient releasing pattern, micronutrients, organic fertilizers