​Effect of Irrigation Regimes and Phosphorus Fertilization on Water-use Efficiency, Phosphorus-agronomic Efficiency and Yield of Grass Pea (Lathyrus sativus L.) Ecotypes

Abstract

Background: Grass pea (Lathyrus sativus L.) is a crop of immense economic significance. It is one of the most resilient to climate changes and to be survival food during drought-triggered famines. Methods: In a field study split factorial experiment based on a randomized complete block design with 3 replications were used, effects of irrigation regimes (50, 75 and 100% evaporation of Pan class A) and different rates of phosphorous fertilizer (triple superphosphate 0, 60 and 120 kg/ha) on growth and yield of two grass pea ecotypes (Lalehzar and Sharekord) in Lalezar area (Kerman province, Iran) was carried out during 2018 and 2019. Result: The results showed that drought stress reduced grass pea seed yield (401 kg/ha-1) and biological yield (863 kg/ha-1) and this reduction was depended on the severity of stress. In the other side, application of phosphorous fertilizer (60 kg/ha-1) increased grass pea yield (2401 kg/ha-1). This means that phosphorus fertilizer could partiaiiy offset the effect of drought stress and had a significant effect on the water use efficiency and phosphorus agronomic efficiency. Finally, drought stress, either no-application phosphorus fertilizer, could decrease yield. Overally, Shahrekord ecotype showed the higher and most desirable grain yield (2401 kg/ha-1), biological yield (5612 kg/ha-1), grain water use efficiency and biological water use efficiency, respectively, with (0.74 and 1.72 m3 water/ha-1) and phosphorus agronomic efficiency (18.76 kg yield/kg P) to the applied treatments (75% irrigation+ triple superphosphate fertilizer 60 kg/ha).

Effect of Different Irrigation Regimes on the Yield and Qualitative Characteristics of Different Cultivars of Soybean (Glycine max L.) in Jiroft

“…The amount of water per plot using water cubic meters per hectare (m 3 water ha -1 ) and the level of each plot is specified and each treatment was provided using a discharge tube (Bahramnejad et al, 2021). Irrigation of each plot was done by drip and using standard tape.…”

“…The final performance of each crop plant genotype is determined by the mutual effects of the plant genotype and the growing environment. Bahramnejad et al (2021) reported drought stress by 50% of irrigation water reduces the yield of Lathyrus sativus L. Under drought stress, the reduction in photosynthesis is due to the increase of free rad icals in the plant and the destruction of the photosynthetic system (Liu et al, 2015;Mouradi et al, 2016;Zegaoui et al, 2017) Effect of Different Irrigation Regimes on the Yield and Qualitative Characteristics of Different Cultivars of Soybean (Glycine max...…”

“…Drought and the resulting stress is one of the most important and common non-living environmental stresses that limit agricultural production and affect almost every aspect of plant growth (Aslam et al, 2006;Manna et al, 2021). According to some researchers, mild irrigation stress in some leguminous plants such as Lathyrus satius L. increases water use efficiency, and the varieties have different resistance to water stress (Alizadeh et al, 2014;Bahramnejad et al, 2021). One of the factor affecting the slow rate of supply is climate change and the phenomenon of global warming, which has faced arid and semi-arid areas with a decrease in rainfall and continuous droughts and has caused a significant increase in the areas affected by drought stress (Qiu et al, 2023).…”

Investigation of Phosphorus and Potassium Biological Fertilizers on Alfalfa (Medicago sativa L.) Physiological Traits at Different Ages of the Field

“…Studied the effects of drought stress and phosphorus on grass pea (Lathyrus sativus L.), the use of phosphorus fertilizer (60 kg/ha) increased the yield of grass pea (2401 kg/ha). This means that phosphorus fertilizer can partially compensate for the effect of drought stress and highly impacts water use and phosphorus agronomic efficiency Bahramnejad et al (2021).…”