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Subject: Agronomy × Author: Anand.B.Mastiholi × End date: 2018 × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Effect of spacing, time of harvest and npk levels on growth, yield and quality of medicinal coleus (coleus forskohlii briq.) under irrigated condition
    (UAS Dharwad, 2008) Anand.B.Mastiholi; S.M.Hiremath
    Field experiments were carried out to study the response of medicinal coleus to spacing, time of harvest and different levels of NPKduring kharif 2004 and 2005 under irrigated condition at Kittur Rani Channamma College of Horticulture, Arabhavi. Results revealed that the spacing of 60 cm x 20 cm produced significantly higher dry tuber (1.57 t/ha) and forskolin yield, net returns (Rs. 56,822/ha) and B: C ratio than other spacing levels. The crop harvested at 180 and 160 days after planting (DAP) recorded significantly higher tuber (1.45 and 1.39 t/ha, respectively) and forskolin yield, net returns and B: C ratio than 140 DAP. Among the interactions, harvesting at 160 or 180 DAP and spacing of 60 cm x 20 cm recorded significantly higher tuber yield, quality and net returns. Application of N at 50 kg per hectare recorded significantly higher tuber (1.65 t/ha) and forskolin yield, net returns and B: C ratio than other N levels. Application of 100 kg P2O5 per hectare recorded significantly higher tuber yield (1.45 t/ha), quality, net returns and B: C ratio than 50 kg P2O5 per hectare. Potassium application @ 50 and 100 kg K2O per hectare produced significantly higher tuber yield (1.49 and 1.36 t/ha, respectively), quality and net returns than 150 kg K2O per hectare. Among interactions, N50P100K100 and N50P100K50 recorded significantly higher tuber yield than other interactions however, they were on par with N50P50K50 and N50P100K150. Net returns and B: C ratio in N50P50K50, N50P100K50 and N50P100K100, and forskolin yield in N50P50K50 were significantly higher than other treatment combinations. The study indicated that planting the crop at the spacing of 60 cm x 20 cm, harvesting at 160 DAP and nutrients application in the combination of N50P50K50 was found optimum for higher tuber yield, quality and returns under irrigated condition.