BAPATLA

This centre was started at Regional Research Station, Acharya N.G. Ranga Agricultural University, Bapatla (Andhra Pradesh) in 1972 during IVth Five year plan to undertake research in coastal regions. The centre is situated in Agro ecological region 18 (Eastern coastal plain, hot sub-humid to semi-arid region) and located at 150 54’ N Latitude and 80029’ E Longitude.

  • Groundwater quality map of undivided Andhra Pradesh for 23 districts up to 2008 was completed and the technical bulletin was released in 2013 after analyzing 35000 groundwater samples for pH, EC, cations, anions, RSC and SAR.
  • Benchmark survey of soil and water was carried out continuously for 41 years since 1974 in Guntur District. It was found that the salinity of groundwater increased from 1.9 to 10.3 dS/m at various locations due to over exploitation of groundwater. However, the increase in soil salinity was up to 4.4 dS/m. To combat these twin problems, groundwater recharge, the conjunctive use of water, gypsum application to soil, selection of salt tolerant varieties, sub-surface drainage systems, crop diversification into fodder crops in adverse conditions were suggested.
  • Salt affected soils of Krishna, East Godavari, West Godavari, Nellore, Chittoore, Srikakulam, Vijayanagaram, Visakhapatnam districts of Andhra Pradesh state were collected using remote sensing data and characterized. Soil maps at 1:50,000 scale were prepared for all the eight districts using GIS.
  • Developed “Improved Doruvu Technology” for skimming of fresh water floating on saline ground water in coastal sandy soils. The technology replaced the traditional doruvu and it has become very popular amongst the farmers of coastal areas of Andhra Pradesh. Around 97 skimming wells are installed. Besides, fresh water for agriculture, the technology has potential application for drinking water supply in coastal belts of Andhra Pradesh.
  • Drip and sprinkler irrigation helped in reducing the ill effects of saline irrigation water upto 4 dS/m in different vegetable crops in coastal sandy soils. The performance of crops under shadenets is found performing better than open field cultivation with saline irrigation water.
  • Amendments viz., gypsum, pyrites, FYM, pressmud cake, etc have been indentified for management of high RSC waters for irrigation to enhance the crop productivity.
  • Sub-surface drainage systems (SSD) viz., closed SSD, open SSD, tile drainage, and corrugated perforated pipelines for reclamation of salt affected and waterlogged soils have been successfully tested on ORP site in coastal agricultural systems and technology is ready for transfer. The subsurface drainage system for reclamation of waterlogged saline soils was tested at Uppugunduru and Appikatla in Krishna Western Delta. The technology has potential in 1.3 lakh ha of waterlogged saline soils of coastal regions and major irrigation command areas of Andhra Pradesh. The soil salinity in drainage area reduced from 8.4 to 1.7 dS/m and consequently paddy yields increased from initial level of 1.8 t/ha to 6.75 t/ha at the end of 7 years.
  • Technology for reclamation of Abandoned Aqua pond lands was developed and demonstrated in coastal AP. Based on survey, it is estimated nearly 3.4 lakh ha area is affected on eastern coast. These fields are belonged to small and marginal farmers and through this technology, it is possible to get rice yields of tune of 4-5 t/ha during initial first or two years of reclamation. The yields were increased by 15-30% in paddy with the availability of sufficient irrigation water.
  • Screening of various crops for salinity tolerance of irrigation water in cereals like rice, maize, oilseed crops like sunflower, soybean, groundnut were carried out.
  • Screening of various vegetable crops (tomato, brinjal, okra, cluster bean, bitter gaurd, chillies, capsicum root crops like radish, carrot and leafy vegetables like spinach/palak) upto 6 dS/m revealed the salinity tolerance in the order of clusterbean >tomato>raddish>carrot> brinjal>okra>bitter guard>chillies >palak > capsicum.
  • Training programmes to farmers, students and other stakeholders like Mandal Agril.Officers., I & CAD engineers, A.E.O’s, Farmers from various districts through ATMA collaboration, were conducted to disseminate the technology developed at SWS, Bapatla.