Yield and Yield Components of Wheat as Influenced by Sowing Date and Humic Acid

Abstract

In order to investigate the effect of seed sowing date and humic acid foliar application on some agronomic traits of bread wheat an experiment was conducted in Islamshahr, Iran during 2013 growing season. The experimental design was a complete randomized block design arranged in factorial with three replications. The first factor was included two sowing date (middle of November and middle of December) and the second factor was included three humic acid levels (0, 4 and 8 liter ha -1 ). The results indicated that late seed sowing lead to significant reduction in agronomic traits such as tiller number, spike number, seed number and seed weight. In addition, vegetative growth was affected by late seed sowing and so that shorter plants were observed. Number of days until spike emergence, number of days until pollination and number of days until physiological maturity decreased due to late seed sowing. By contrast, humic acid application increased plant growth and improved yield and yield components through extending growing period.

Morpho-agronomic characters of oat growing with humic acid and zinc application in different sowing times

“…The stimulating effect of both HA and Zn is partly associated with the higher uptake of mineral nutrients (33). Similarly, positive effects of HA and Zn application on the yield of different crops such as pearl millet (34), wheat (30,31,35,36) and sunflower (37) have been reported in other studies. In some studies, it has been shown that 5 or 10 kg Zn ha -1 ( 25-50 kg ZnSO ⁓ 4.7H2O) application is sufficient for high yield of cereals (38,39).…”

Yield and Yield Components of Durum Wheat as Influenced by Humic Acid, Zinc and Iron Application

“…The overall effect of humic acid (HA) application showed a positive response, significant or insignificant, to spraying of 2.4 kg/ha HA compared to the control. Several researchers reported significant positive effects of HA on grain yield (Antoun et al, 2010, Khan et al ,2010and Manzoor et al ,2014, 1000-grain weight (Knapowski et al ,2015 andAL-Erwy et al ,2016), number of tiller plant (Yasin andEL-Sobky,2017 andBaqir andZeboo, 2019) biological yield (Kandil et al ,2016 andDincsoy andSonmez, 2019) and number of grains/spike (Doroodian et al ,2015 and Yassin and EL-Sobky 2017) of wheat plants. However, durum wheat cultivars showed differential response to application of HA (Fig 1 and 2, a, b and c) where both cultivars Bani Sweif6 and Sohag3 showed a positive response to HA application compared to control with regard to grain yield, while Casino cultivar revealed a negative response to HA spraying.…”