SR Potdukhe, Kanchan Bramhnakar, Tini Pillai and SS Isokar
Azolla is small aquatic fern which has symbiotic association with nitrogen fixing Anabaena azollae. It is used as the green manuring crop for rice cultivation. An experiment entitled “Role of phosphatic fertilizer on growth and yield of Azolla microphylla” was undertaken at Plant Pathology Section, College of Agriculture, Nagpur during the year 2022-2023. The experiment was carried out in Completely Randomized Design (CRD) in ten treatments with three replication and ten treatments The observations such as fresh and dry weight of Azolla, chlorophyll content, heterocyst per cent, root length, frond size and nitrogen and phosphorus content were estimated at 15, 30, 45 and 60 DAI. It was revealed from the FRP tank (30x70x30 cm2) experimentation, that among the Phosphatic fertilizers SSP (Single Super Phosphate) at 100 g/tank was found significantly superior over all other split doses phosphatic fertilizers. Significantly higher fresh weight of Azolla was obtained by the treatment T1 (SSP 100 g/tank) 528.46 g/tank at 60 DAI and dry weight (42.27g/tank). Root length was significantly affected by SSP, DCP, TCP over uninoculated control. Application of SSP at 100 g/tank increased the root length 8.0 cm, 8.5 cm, 8.9 cm and 9.2 cm at 15, 30, 45 and 60 DAI. Similar observation of SSP at 100 g/tank treatment enhanced frond length 1.5cm,1.8 cm,2.1 cm and 2.5 cm at 15, 30, 45 and 60 DAI respectively. It was recorded from the data that the treatment addition of SSP at 100 g/tank was best in increasing all the parameters significantly and can be used for the multiplication of Azolla in the FRB tank.
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