11. Impact of humic acid with organic and inorganic nitrogen sources on growth and yield traits of maize (Zea mays L.)

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Jihad Ali, Yousaf Jamal, Muhammad Ismaeel, Mushtaq Ali, Mehwish Dalil, Muhammad Babar

Abstract

Overreliance on commercial fertilizers for crop production has caused various ecological hazards related to global warming, climate change, soil degradation and pollution. A field trial was conducted at Agricultural Research Station, Swabi, Khyber Pakhtunkhwa, Pakistan during kharif 2019, to investigate the impact of humic acid and organic and inorganic nitrogen sources on maize crop. Maize variety Jalal was sown in Randomized Complete Block Design (RCBD) having split plot arrangement. The trial was replicated three times. Two levels of humic acid (H0 = control and H1=20 kgha-1) were allotted to main plots while various N sources (control, FYM, Poultry manure, compost and urea) to subplots. Humic acid, organic manures and basal dose of P2O5 and K2O were applied at sowing time while N was applied in two splits. Results showed that humic acid application significantly increased days to tasseling (53.80), silking (58.66), maturity (98.66), leaf area (526.86 cm2), plant height (209.13 cm), cob length (17.18 cm), grains cob-1 (398.87), 1000-grains weight (328.80 g), biological yield (12725 kg ha-1), grain yield (4616.7 kg ha-1) and harvest index (36.17 %) over control. In case of N sources, late tasseling (55.66) days, silking (60.33) days, maturity (98.66) days, highest leaf area (555.44 cm2) and plant height (213.50 cm) were observed in case of Poultry manure treatment. Whereas, maximum cob length (18.30 cm), grains cob-1 (431.33), 1000-grains weight (344.17 g), biological yield (13671 kg ha-1), grain yield (5169.7 kg ha-1) and harvest index (37.77 %) were recorded in plots receiving N from compost. Hence, the results concluded that compost and poultry manure as N sources with integration of humic acid were found most suitable for maximum values of growth and yield attributes, particularly grain yield (5169.7 kg ha-1).


Keywords: Humic acid; Maize; Nitrogen; Organic manures: Yield


http://dx.doi.org/10.19045/bspab.2023.120012

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