Multi variety green manuring for sodic soil management
Organic sources are known to improve the soil conditions and green manuring was a recommended practice for problematic soils. The multi variety green manuring technique, popularly known as Dhabolkarmethod for management of problematic soils, was tested in the selected farmers’ fieldsby providing multi variety green manure seed consisting of 15-20 types of seeds including cereals, pulses, oil seeds, green manures and spices @ 20 kg/ac. Green manure crops were grown for 45 days and incorporated into the soil before puddlingand then rice was transplanted.
Sodicity/alkalinity is a major soil problem in many districts of Telangana and many farmers from different villages of Rangareddy and Nalgonda districts expressed the problem of soil sodicity that is causing yield reduction to an extent of 50-60% than normal yields. Hence, it was felt that management of these sodic soils would be ideal in these villages. Consequently, a field survey was done and most problematic soils were selected for demonstration of the technology under FLDs for four years in four villages of two districts of Telangana.
Field testing results
- The difference between demonstration plot and control plot were very clear where control plot showed nutritional deficiencies due to alkalinity problem and treated plots were green showing good crop growth.
- Higher yields were recorded in sodic soils due to improvement in plant population, crop stand, crop growth, more number of tillers and panicles
- The yield improvement ranged from 16.1 to 31% due to improved practice over control
- The soil data indicated different degrees of improvement in soil properties where the was reduction in pH and improvement in organic carbon and other nutrients to a greater extent in some fields and there was a little improvement in other fields in a two year period.
Green manure crops Control field GM added crop Demonstration plot
Practical Utility/ Scalability
- By using this simple technology of growing diverse crops as green manures the soil physical, fertility and biological properties will be improved and increases the yield of rice crop.
- It converts problem soils into fertile soils.
- It improves soil health as well as plant health and increases the farmer’s income by increasing the yield.
- Government can encourage this practice in problem soil areas by providing subsidy for the seed material.