Mansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-368511520200501Effect of Gypsum, K-Humate and Plant Growth Promoting Bacteria on Improvement of Soil Properties and Productivity of Wheat and Maize Irrigated by Saline Water12913910358710.21608/jssae.2020.103587ENHesham MahmoudAboelsoudSoil Improvement and Conservation Dept., Soils, Water & Environment Res. Institute (SWERI), Agric. Res. Centre (ARC), Giza, Egypt0000-0002-2654-1732Journal Article20200718Because of water shortage in North Nile Delta, Egypt, some farmers have to irrigate their crops by saline water. So, soils and/or plants are preferred to be treated by some amendments to alleviate the hazardous effects of salt stress. Two field experiments were conducted at Sakha Agric. Res. Station Farm, Kafr Elsheikh Gov., Egypt, to study the effect of gypsum (50, 75 and 100% of gypsum requirement, 8.2 t ha<sup>-1</sup>), K-humate (5 and 10 kg ha<sup>-1</sup>) and inoculation with plant growth-promoting-rhizobacteria (PGPR), (10<sup>8</sup>-10<sup>9</sup> colony, ml<sup>-1</sup>) on soil properties and productivity of wheat (2018/19) and maize (2019) irrigated by saline water (0.7 and 2.43 dSm<sup>-1</sup>). The results revealed that plant height, grain filling, grain and straw yields of wheat and maize were negatively affected by irrigation water salinity. Also, irrigation water salinity clearly affected soil ECe and ESP, while it slightly affected soil bulk density and total porosity. Also, soil ECe, ESP, bulk density and total porosity were slightly affected by application of gypsum, K-humate and PGPR. The biomass yield, plant height and grain filling in both crops were positively affected by gypsum application, whereas it alleviated the adverse effects of salinity on crop growth. Also, K-humate with PGPR positively affected the crop yield and its attributes. The bio amendments alleviated the harmful effects of salinity stress on both crops. Finally, 100% gypsum combined with higher rate of K-humate and PGPR treatments was more effective treatment on plant growth and alleviated the harmful effects of salinity stress on plant growth.Mansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-368511520200501Phosphorus Availability, Uptake and use Efficiency of Barley & Maize Yields as affected by Green Manures14115010359010.21608/jssae.2020.103590ENR. A.El-DissokySoils, Water and Environment Research Institute, Agricultural Research Center, Giza, EgyptM. A.AiadSoils, Water and Environment Research Institute, Agricultural Research Center, Giza, EgyptKholoud A. A.El-NaqmaSoils, Water and Environment Research Institute, Agricultural Research Center, Giza, EgyptJournal Article20200718Green manures refer to soil fertility building crops, which may be broadly defined as crops grown for the benefit of the soil.They have been use in traditional agriculture for thousands of years but today's they are still limited utilized by farmers.A Lysimeters experiment was conducted at Sakha Agricultural Research Station,Egypt to assess the effect of green manures, and phosphorus fertilizer on some soil properties, phosphors use efficiency and yields of barley (in winter season 2016/2017) following by maize (in summer 2017). The experiment was arranged in split plot design with three replicates. The main plots were devoted to green manures: control (without green manure), as Lentil plants (<em>Lens culinaris Medikus</em>) and as Rocket plants (<em>Eruca sativa</em> L.); the sub plots were arranged in four rates of mineral phosphorus fertilizers: control: (without addition),7.5, 11.25 and 15.5 kg P<sub>2</sub>O<sub>5</sub> fed<sup>-1</sup>.The obtained results illustrated that using green manures i.e., lentil and rocket before planting barley significantly improved soil properties; increased the availability of the nutrients (NPK), and total porosity. Interaction between green manure as a rocket with mineral P-fertilizer rate at 15.5 kg P<sub>2</sub>O<sub>5 </sub>fed<sup>-1</sup> attained the highest values of biological yield, harvest index, grain weight, and nutrients-uptake of NPK of barley and maize. The use of rocket as green manures with mineral phosphorus fertilizer at a rate of 11.25 kg P<sub>2</sub>O<sub>5</sub> fed<sup>-1</sup>(75% of RD)maximized barley and maize yields and phosphorus use efficiency.So,the study concluded the importance of using green manures to improve soil fertility and properties and mineral phosphorus fertilizer use efficiency<strong>.</strong>Mansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-368511520200501Improving Performance of the Poultry Eggs Incubator using the Pulse Repetition Frequency15115610359110.21608/jssae.2020.103591ENAmany MetwallyAgricultural Engineering
Faculty of agriculture, Zagazig university,EgyptJournal Article20200718In recent years, research on a poultry egg incubator has become very interesting, especially quail eggs. The main objective of this study is applied to Pulse Repetition Frequency (PRF) as an innovative technique used to control the power supply for the pulse's generator. The experiments were carried out to apply the PRF technique during an incubation process through design and build an electronic circuit for producing a pulse repetition frequency signal to control the pulses generated using PRF circuit. This circuit was used to generate PRF waves so that the frequency pulses of the generator can be adjusted as required level during the integrated circuit. The incubator performance was evaluated under the following parameters: four different pulse intensities (48, 60, 72 and 84 W.m<sup>-2</sup>) and frequency durations (10, 15, 20 and 25 minute per hour), taking into consideration the following indicators: hatchability, mortality, and incubator efficiency. The obtained results reveal that the highest hatchability percentage of 89% and a mortality of 17% with incubator efficiency of 83%. It was observed that the consumed energy value of 529W.h <strong>.</strong>The quail egg incubator is recommended to be used under a pulse intensity of 72 W.m<sup>-2</sup> with a frequency duration of 25 minutes per hour. The results of this research are difficult to compare with other studies because there is no data on this subject in the available literature.