Professional Information
Area of specialization Soil Science & Agricultural Chemistry
Area of interest Site specific nutrient management, Geoinformatics applications in soil resourses assessment, precision farming
Number of institute projects completed 9
Number of Institute projects being handled 1
Number of externally funded projects completed 2
Technologies developed Chemistry of laterite soils under rubber and cassava of Kerala with special emphasis on hardening and softening was studied in detail by physico-chemical analyses, XRD, SEM and Micromorphology. Increased rate of under rubber than under cassava. Calcium silicate, cow dung and green manuring are very effective in softening already hardened laterite.
A fertilizer recommendation of 50:50:75 kg ha-1 N, P2O5 and K2O has been developed for sweet potato cultivation in Eastern India. The activity ratio of potassium (AReK) showed significant positive correlation with water soluble, exchangeable and 1N HNO3 values.
In eastern and north-eastern India where sweet potato tuber cracking is a serious problem, a recommendation of 1.5 kg ha-1 boron applied as borax at the time of planting sweet potato vines has been evolved. An amount of 66 g of boron is taken up by sweet potato to produce 1 ton of tuber. Simple methods to calculate fertilizer boron requirement of sweet potato for a given targeted yield are developed.
For sweet potato the recommended nitrogen dose of 50 kg ha-1 can be reduced to 33 kg ha-1 if we apply Azospirillum @ 10 kg ha-1 in soil or in combination with application of Azospirillum as vine dipping @ 2 kg ha-1. Apart from the direct role in N fixation, production of plant growth promoting substances (phytohormones) has also been found to be associated with the response of sweet potato to Azospirillum inoculation.
A very successful management practice to control cassava tuber rot, a very serious problem in Salem, Tamil Nadu has been developed. I). deep ploughing to 50-65 cm depth, ii). Ridge and furrow method of planting, iii). Application of neem cake @ 250 kg ha-1 at final land preparation, iv). Application of Trichoderma viride @ 1 kg ha-1 mixed with 100 kg cow dung at the time of planting, v). removal and burning of infected tubers and, vi). Following crop rotation with millets, pulses, turmeric and sugarcane.
Site specific nutrient management (SSNM) technology for cassava cultivation has been developed for Tamil Nadu and Andhra Pradesh. Soil fertility maps of Salem, Namakkal (T.N) and East Godavari (A.P) districts are developed to help planners and policy makers. Detailed fertilizer calculation charts are developed for SSNM of cassava in Tamil Nadu and Andhra Pradesh.
Leaf Colour Chart (LCC) and Chlorophyll Meter (SPAD-502) have been standardized for real time nitrogen management of cassava. Critical leaf and critical values of the above two tools have been developed.
A nutrient decision support system (NuDSS) software has been developed for site specific nutrient management of cassava, CASSNUM.
GIS based fertilizer prescription maps were developed for site specific nutrient management (SSNM) of cassava in India.