Dr H.S. Rattanpal is associated in the release of eight varieties viz., PAU Kinnow-1, Daisy, W. Murcott, Star Ruby grapefruit, fig varieties Brown Turkey and Black Fig I, sapota varieties Kalipatti and Cricket Ball besides, released four citrus stionic combinations viz., Carrizo as rootstock for Kinnow, Daisy and W. Murcott varieties, and rough lemon for Daisy in soils having pH higher than 8.0.

Dr Rattanpal developed fourteen production technologies for citrus and sapota. He established tissue culture laboratory in the Department of Fruit Science and worked on cell-level selection for Phytophthora and salinity-tolerant rough lemon rootstocks for DBT projects. Dr Rattanpal established the irradiation facility and procured the Gamma chamber, which is being used extensively by the scientists of this university for mutation breeding. Dr Rattanpal remained scheme Incharge of the All India Coordinated Research Project on Tropical Fruits (now Fruits) since 2004.

He contributed 233 scientific and other publications. Guided 14 M.Sc. and six Ph.D. students and taught 226 credit hours of undergraduate and postgraduate courses in horticulture and biotechnology. Delivered 46 lectures in short-duration training, Kisan melas and attended fruit shows. He attended two international and 48 national symposia. Visited three countries for attending various training or symposia.