Abstract

The present study was carried out at Nubaria Region, El- Beheira Governorate, Egypt, during the two summer seasons of 2019 and 2020 to study the effect of foilar application of salicylic (SA) and ascorbic acids (ASA) on yield and quality of soybean cv. Giza 111 under drip irrigation. This experiment was laid out in the factorial experiment (two factors) in randomized complete blocks design (RCBD) in three replications. The first factor was salicylic acid (SA) concentrations (water = control, 500, 1000, and 1500 ppm), while the second factor was ascorbic acid (ASA) concentration (water = control, 500, 1000 and 1500 ppm) in both seasons. The obtained results showed that foliar application of salicylic acid (SA) and ascorbic acid (ASA) significantly affected plant height (cm), number of branches/plant, number of pods/plant, 100- seed weight (g , seed yield (kg/fed), straw yield (kg/fed), biological yield (kg/fed), harvest index (%), and oil content (%) in the two seasons, whereas increasing of SA and ASA from 500 up to 1500 ppm increased all the studied characters as compared with the control treatments (water spray) in both seasons. The interaction between the foliar application of SA and ASA concentration was significant on all the studied characters in both seasons, where using 1500 or 1000 ppm SA/fed + 500 or 1000 ppm ASA achieved the highest mean values of all the studied characters in the two cropping seasons in drip water irrigation under the study conditions.

Highlights

  • Soybean (Glycine max L.) is widely cultivated for its edible bean, which has many uses

  • The results obtained in Table (3) reported that plant height, number of pods/plant, and 100- seed weight (g) of soybean were significantly affected by foliar application of salicylic acid (SA) and ascorbic acid (ASA) in 2019 and 2020 seasons

  • Results in this Table (3) reported that the increasing of SA concentration increased plant height, number of pods/plant, 100- seed weight (g) but it did not affect a number of branches/plant of soybean in both seasons, where the highest mean values of plant height, number of pods/plant, 100- seed weight (g) recorded with foliar application of SA up to 1500 ppm, followed by 1000 ppm from SA which had no significant difference between its concentrations, while the lowest values of plant height, number of pods/plant, 100- seed weight (g) of soybean were given with spray water treatment in the first and second seasons

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Summary

Introduction

Soybean (Glycine max L.) is widely cultivated for its edible bean, which has many uses. Soybean is the most important protein source for animal feeding and human food. Soybean is valued for its high protein content (38 – 45 %), soybean seed contains 18–19 % oil (Livestock's long shadow, 2016).Soybean is a globally important crop that provides protein and oil for a wide array of products. Soybean seed is made up of crudely 40 % protein, 20 % oil, 35 % carbohydrate and 5 % ash (Soares et al, 2008).Total cultivated area of soybean in the world in 2018 was about 123.5 million ha which produced about 352.6 million tons, while in Egypt, the cultivated area was about 15000 ha produced approximately 45000 ton from dry seeds (FAO STAT, 2018). Soybean is very sensitive plant to drought and salinity conditions during vegetative and reproductive growth. Since soybean is classified as dehydration-sensitive species that require

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Results

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