PJB-2024-162
EFFECT OF COATED UREA AND DIFFERENT LEVELS OF HUMIC ACID ON YIELD AND YIELD COMPONENTS OF MAIZE
Sufyan Hameed
Abstract
ABSTRACT
Combined application of nitrogen and humic acid is important for increasing crop yield. This experiment was conducted at the Agronomy Research Farm, The University of Agriculture Peshawar, during spring 2023. Research consists of two factors: coated urea (control, non-coated urea, clay coated urea, sulfur coated urea and gypsum coated urea) providing total of 150 kg N ha-1 and levels of humic acid (0, 6, 12 and 18 kg ha-1) All treated plots were randomly allotted in the RCBD (randomized complete block design) with three replications. Among the different sources of coated urea, maximum days to tasseling (63.8), days to silking (70.4), days to physiological maturity (107.1), dry matter yield at silking (150.7 g plant-1), dry matter yield at physiological maturity (263.1 g plant-1), number of leaves plant-1 (12.6), leaf area plant-1 (4886 cm2), LAI (2.8), plant height (211.5 cm), ear length (15.3 cm), ear m-2 (7), rows ear-1 (14), grains row-1 (33), grains ear-1 (422), 1000 grains weight (230.8 g), grain yield (4373 kg ha-1), biological yield (13549 kg ha-1), harvest index (32.3 %), shelling percentage (82.5 %) and nitrogen use efficiency (11.5) were noted when 150 kg N ha-1 applied from sulfur coated urea. In case of the humic acid, maximum days to tasseling (63.4), days to silking (70.1), days to physiological maturity (105.6), dry matter yield at silking (149.4 g plant-1), dry matter yield at physiological maturity (250.2 g plant-1), number of leaves plant-1 (11.9), leaf area plant-1 (4564 cm2), LAI (2.5), plant height (212.0 cm), ear length (15.2 cm), ear m-2 (6), rows ear-1 (13.5), grains row-1 (32), grains ear-1 (397), 1000 grains weight (224.8 g), grain yield (3967 kg ha-1), biological yield (12448 kg ha-1), harvest index (31.7 %), shelling percentage (82.0 %) and nitrogen use efficiency (10.5) were reported when 18 kg ha-1 humic acid applied. Interaction between coated urea and humic acid levels (CU × HA) was found significant for the dry matter yield at silking stage, dry matter yield at physiological maturity stage, number of leaves plant-1, leaf area plant-1, LAI, plant height, ear length, ears (m-2), biological yield and harvest index, while interaction was found non-significant for the rest of parameters. It was concluded that nitrogen application at the rate of 150 kg ha-1 from the sulfur coated with the application of humic acid at the rate of 18 kg ha-1 is recommended for improving growth, yield and yield components of spring maize in the agro-ecological condition of Peshawar.
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