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Water scarcity and weed infestation are major challenges to soybean production. Therefore, two field experiments were conducted in a strip plot design including three replicates in the 2019 and 2020 summer seasons at Sakha Agricultural Research Station, Agricultural Research Centre, Egypt, to investigate the effect of three irrigation levels (I0 (100%), I1 (90%), and I2 (80%)), and six weed control treatments of pendimethalin (T1), oxyfluorfen (T2), bentazon + clethodim (T3), imazethapyr (T4), hand-hoeing twice (T5), and untreated check (T6) on annual weeds, physiological traits, water relations, and yield and its components of soybean cv Giza 111. Results indicated that intermediate irrigation levels lead to the highest yield and economic return, while the herbicide program that resulted in the greatest weed control gave the highest yield. The rate of weed infestation in field experiments was 19.7 and 21.8 t ha−1 dry weights, which decreased soybean yield by 56.9 and 57.1%, compared to treatment (T4). The interactions between 100 irrigation level (I0) and imazethapyr (T4), bentazon + clethodim (T3), and hand-hoeing twice (T5) gave the highest significant values of the most studied characters. Furthermore, under 90% irrigation, all weed control treatments give the best control of weeds and the highest values of the economic criteria. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Soil Sciences & Agricultural Engineering is the property of Egyptian National Agricultural Library (ENAL) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A field experiment was conducted at Sakha Agricultural Research Station Farm, Kafr El-Sheikh Governorate. The site is located at middle North of Nile Delta with 30°-57' N latitude, 31°-07'E longitude and altitude of about 6 meters above mean sea level, during the two growing seasons 2013/2014 and 2014/2015 to study the conjunction use of rainfall with irrigation on water productivity (WP) of faba bean. Irrigation treatments were; treatment A (rainfall i.e. given only the sowing irrigation and left to rainfall during the growing season (control), treatment B (given one irrigation following the sowing one), treatment C (given two irrigations after the sowing watering) and treatment D (given three irrigations following the sowing irrigation traditional irrigation) for faba bean cv. Giza 843 in a complete randomized design with three replications. The highest average values of water applied and consumptive use were 465 mm and 442 mm under treatment D in the two growing seasons, respectively. The contribution percentages of rainfall to water applied (Wa) were 36.4% and 55.8 % for treatments D and A, respectively. Given only sowing irrigation (rainfall treatment) produced about 70% from that received 3 irrigations following the sowing one. To get nearly maximum yield, only two irrigations after the planting watering could be applied with saving water 206.5 m3 fed-1 or 10.6%. On the other hand, the highest mean values of water productively (WP) and productivity of water applied (PWa) were recorded under treatment B in the two seasons and the values were 1.23 and 1.12 kg m3, respectively. For faba bean; seed yield, harvest index, plant height, 100-seed weight and No. pods/ plant gave the highest values under irrigation treatment D. Results also showed that all characteristics of faba bean were significantly affected by irrigation treatments in both growing seasons. [ABSTRACT FROM AUTHOR]