Performance of Coleus (Coleus forskohlii) in Different Agro-climatic Zones of Tamil Nadu, India
2022
Balasubramanian, V. | Suresh, J. | Srinivasan, R. | Prabhu, M. | Karthik, B. | Gokul Nandha, V.B.
Astudy was undertaken to characterize the Coleus-growing soils in different agroclimatic zones of Tamil Nadu to identify the yield limiting soil properties and management. The soil characteristics were rated for their quality as low, medium and high of three zones to assess. The horizon-wise soil samples from Typifying soil profiles and surface samples were collected from representing agro-climatic zones and soils were analysed. Soils were shallow to deep, well to somewhat poorly drained, dark brown to dark reddish brown in colour. The soils were sandy clay loam to sandy clay in texture and the clay content ranged from 28 to 45% being highest in Muthur soils. The organic carbon in soils ranged from 0.30 to 0.90% and + -1 cation exchange capacity from 10.2 (Rajapatty soils) to 22.8 cmol (p ) kg (Andipudur soils). Soils were low in available nitrogen, low to medium in available phosphorus and potassium. DTPA-extractable micro nutrients were sufficient in all the zones. Coleus yields were significantly correlated with available phosphorus, potassium and manganese.
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