Effect of nano NPK on growth, yield and quality of marigold (Tagetes erecta L.) cv. BM 4

The present investigation entitled “Effect of Nano NPK on growth, yield and quality of marigold cv.BM 4” was carried out during rabi season of the year 2023-2024 at Floricultural Research Station, Rajendranagar, Hyderabad. The experiment was carried out with ten (10) treatments in Randomized Block Design with three (3) replications. Treatments include combination of three levels of RDF with five levels of nano NPK i.e., 2.5, 5, 7.5, 10 and 12.5 ml was laid out to study the efficacy of nano NPK.T6 (RDF 50% + 10 ml each of Nano NPK 3 sprays at 30, 60 and 90 DAT) recorded the maximum plant height (75.6cm), maximum plant spread in East-West (75.33 cm), in North-South (75.67cm) and maximum number of branches per plant (9 cm).The treatment T10 Control (100% RDF) recorded minimum number of days to 50% flowering (37.33 days), minimum number of days to full bloom (46.53 days) and maximum duration of flowering (46.53 days) compared to other treatments. Whereas the treatment T6 (RDF 50% + 10 ml each of Nano NPK) recorded maximum flower diameter (6.87 g), maximum weight of single flower (15 g), maximum number of maximum number of flowers per plant (35.53), maximum flower yield per plant (245.67 g), maximum flower yield per plot (4.91 kg), and maximum flower yield per hectare (9.4 t). The maximum shelf life (3.95 days), maximum seed yield per flower (1.5 g) and maximum seed yield per plant (5.59 g) and the maximum Benefit : Cost (2.21) compared to other treatments. From the study it can be concluded that the treatment T6 (RDF 50% + 10 ml each of Nano NPK) recorded significantly maximum growth and flowering parameters compared to other tratments.