Abstract
Weeds are the major constraint to realize the potential yield of potato crop (Solanum tuberosum) grown under a poplar-based agroforestry system.The objective of the study was to increase the productivity of the poplar-potato intercropping system through the optimization of tree-crop planting geometry with a selection of appropriate weed control measures. Two planting geometries each of poplar (8 m × 2.5 m, 7 m × 3 m paired at 2.5 m) and potato (65 cm × 18.5 cm, 75 cm × 15 cm) with six weed control treatments (atrazine 0.250 kg ha−1, metribuzin 0.350 kg ha−1, paraquat 0.300 kg ha−1, clodinafop + metribuzin 0.270 kg ha−1, weed free check and weedy check) were investigated for two years (2017–18 and 2018–19). It was observed that these applied herbicides had no phytotoxic effect on the 5 and 6-year-old poplar trees. Broad-leaved weeds dominated the sedges under the poplar-potato based agroforestry system. The potato planting geometry 75 cm × 15 cm recorded a higher weed suppressing ability till 90 days after planting (DAP). Intercropping of potatoes at 75 cm × 15 cm spacing under poplar plantation (8 m × 2.5 m) produced higher tuber weight hill−1 (343.6 and 281.6 g hill−1) and increased tuber yield by 21.8% (averaged over both years) in comparison to other poplar-potato planting geometry with clodinafop + metribuzin 0.270 kg ha−1. This herbicide recorded a nearly 84.2% decrease in total weed biomass at 90 DAP with an increased tuber yield up to 50% (29.3 and 28.9 Mg ha−1) than the weedy check (19.6 and 19.3 Mg ha−1). Findings imply that an integrated effect of poplar spacing 8 m × 2.5 m with closer potato planting geometry (75 cm × 15 cm) applied with clodinafop + metribuzin 0.270 kg ha−1 proved to be the best combination for improving the productivity of potatoes under poplar based agroforestry system.
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The authors of this manuscript are grateful to the Indian Council of Agricultural Research, New Delhi for financial assistance through the All India Coordinated Research Project on Agroforestry and Punjab Agricultural University for providing basic infrastructure, land and laboratory facilities.
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Parija, B., Kaur, N., Kaur, T. et al. Optimization of planting geometry and weed control improves the productivity of potato under poplar-based agroforestry system. Agroforest Syst 97, 1055–1069 (2023). https://doi.org/10.1007/s10457-023-00847-x
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DOI: https://doi.org/10.1007/s10457-023-00847-x