Studies on planting geometries and weed control measures on interference in herbage yield and quality of Kalmegh [Andrographis paniculata (Burm. F.) Wall Nees]
Loading...
Date
2016-08
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Field experiments was conducted during kharif season of 2014 and 2015 at MRDC of G.B. Pant University of Agriculture and Technology, Pantnagar (Uttarakhand), India to study the effect of planting geometries and weed control measures on growth and herbage yield of kalmegh (Andrographis paniculata Nees). The soil of experimental site was sandy clay loam in texture having high organic carbon, low available nitrogen, high available phosphorus and medium in exchangeable potassium with slightly alkaline in reaction. The experiment, treatments comprising of three planting geometries (P1 = 30 cm × 20 cm, P2 = 40 cm × 25 cm and P3 = 50 cm × 30 cm) and six level of weed control practices (W1 = Pendimethalin 30 E.C. PE @1 kg a.i./ha followed by mechanical weeding by hand hoe at 30-35 DAT, W2 = Quizalofop ethyl 5 E.C. PoE @ 50 g a.i./ha at 3-5 leaves stage of weeds followed by mechanical weeding by hand hoe at 30-35 DAT, W3 = Pendimethalin 30 E.C. PE @1 kg a.i./ha + Quizalofop ethyl 5 E.C. PoE @ 50 g a.i./ha at 3-5 leaves stage of weeds, W4 = Pendimethalin 30 E.C. PE @1 kg a.i./ha + Quizalofop ethyl 5 E.C. PoE @ 50 g a.i./ha at 3-5 leaves stage of weeds followed by mechanical weeding by hand hoe at 30-35 DAT, W5 = Weedy check and W6 = Weed free) were laid out in split plot design keeping planting geometries in main plot treatment and weed control practices as sub plot treatment with three replications.
Planting geometries and weed management practices had a significant effect on growth attributes viz., plant height, number of branches, leaf to stem ratio, relative growth rate, etc at all the stages during both the years. Significantly more growth and development of kalmegh plant were recorded under wider planting geometries at all the stages of crop. Wider planting geometries recorded significantly higher andrographolide content compared to closer geometries during both the years. Significant more dry matter accumulation/m2 by plant, higher dry herbage yield, andrographolide yield, and nutrient uptake, benefit cost ratio per hectare were recorded under closer planting geometry.
Density and dry weight of total weeds significantly decreased with the increased planting geometries at all the stages of crop during both the years. No phytotoxic effect of herbicides on crop was noticed during both the years. Weed free at all planting geometries recorded significantly higher values of dry herbage yield, andrographolide yield and higher nutrient uptake per hectare at all the planting geometries. This treatment was followed by W4 and W1 during both the years. However, the higher content of andrographolide in kalmegh was produced under weedy check conditions under all the planting geometries during both the years. Looking for the herbage yield and B: C ratio of this two years experimentation, planting geometry P1 (30 cm × 20 cm) with the three weed control practices viz. W4 (pendimethalin 30 E.C. PE @1 kg a.i./ha + quizalofop ethyl 5 E.C. PoE @ 50 g a.i./ha at 3-5 leaves stage of weeds followed by mechanical weeding by hand hoe at 30-35 DAT); W1 (pendimethalin 30 E.C. PE @1 kg a.i./ha followed by mechanical weeding by hand hoe at 30-35 DAT) and W6 (weed free) are at par and may be recommended.
Description
Keywords
null