PHD theses : Engineering

Permanent URI for this collectionhttps://repository.neelain.edu.sd/handle/123456789/507

Browse

Filters

20111

Settings

End date: 2019Subject: search.filters.subject.Agricultural Engineering

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Effect of Ground Water Quantities and Some Tillage Practices on Soil Reclamation
    (Al Neelain University, 2011) Salah Eldin Abdel Rahman Salih
    This study was conducted at the Demonstration Farm of the Faculty of Agricultural Technology and Fish Science, University of Al Neelain inside Sondos Agricultural Project during the summer seasons of 2009 and 2010. The experimental site lies in Jebel Awlia area, 50 km south of Khartoum. The site lies in the semi-arid zone and its soil is believed to be salt affected. The objective of the study was to investigate the effect of irrigation water amount and tillage practices on salt leaching down the profile. Two irrigation water quantities were used. Namely: crop water requirement (CWR) + 10% and CWR + 20% leaching fraction (L.F.) from CWR and four tillage treatments, disc plow, chisel plow disc harrow and minimum tillage. Soil samples were taken from depths: 0 – 30cm, 30 – 60 cm and 60 – 90 cm. Sorghum bicolor [L. Moench] cultivar Abu Sabein was grown as an indicator crop. The experimental design followed was the completely randomized block design. The treatments were replicated three times. The soil of the site was found to be salty affected soil. The effect of soil depths and irrigation water quantities on soil pH was not significant. Whereas, tillage practices showed superiority of chisel plow and disc harrow over zero tillage and disc four tillage treatments, disc plow, chisel plow disc harrow and minimum tillage. Soil samples were taken from depths: 0 – 30cm, 30 – 60 cm and 60 – 90 cm. Sorghum bicolor [L. Moench] cultivar Abu Sabein was grown as an indicator crop. The experimental design followed was the completely randomized block design. The treatments were replicated three times. The soil of the site was found to be salty affected soil. The effect of soil depths and irrigation water quantities on soil pH was not significant. Whereas, tillage practices showed superiority of chisel plow and disc harrow over zero tillage and disc plow. Sodium adsorption ratio (SAR) values were higher in depths 30 – 60 and 60 – The soil of the site was found to be salty affected soil. The effect of soil depths and irrigation water quantities on soil pH was not significant. Whereas, tillage practices showed superiority of chisel plow and disc harrow over zero tillage and disc plow. Sodium adsorption ratio (SAR) values were higher in depths 30 – 60 and 60 – 90cm than 0 –30cm. Whereas, CWR+20L.F. has superiority over CWR+10%L.F. No significant difference was found due to the tillage treatments. Electrical conductivity (ECe) showed a higher values in the depth 60 – 90cm but no significant difference for irrigation water quantities and tillage treatments. Calcium carbonate (CaCO3) gave higher values in depths 30 – 60 and 60 – 90cm over 0 – 30cm, whereas, CWR+10%L.F. gave a higher value over CWR+20%L.F. while for tillage treatments chisel plow and disc harrow gave higher values over disc plow and minimum tillage. As for plant height, stem diameter and fresh weight yield, CWR+20%L.F. resulted in higher values over CWR+10%L.F. Chisel plow was found to be superior than the other tillage treatments. As for leaves/plant and leaves: stem ratio no significant difference was found with respect to irrigation water quantities and tillage during the two seasons. As for dry weight, there was no significant difference due to water quantities but chisel plow resulted in higher values than the other three tillage treatments. Crude protein% and ash% were not significantly affected by irrigation water quantity and tillage, but crude fiber% was found to be higher in chisel plow treatment than the other tillage treatments. CWR+10%L.F. and chisel plow treatment resulted in higher values of water use efficiency than the other combination of treatments. than the other tillage treatments. As for leaves/plant and leaves: stem ratio no significant difference was found with respect to irrigation water quantities and tillage during the two seasons. As for dry weight, there was no significant difference due to water quantities but chisel plow resulted in higher values than the other three tillage treatments. Crude protein% and ash% were not significantly affected by irrigation water quantity and tillage, but crude fiber% was found to be higher in chisel plow treatment than the other tillage treatments. CWR+10%L.F. and chisel plow treatment resulted in higher values of water use efficiency than the other combination of treatments. Cost analysis for tillage treatments during the two seasons showed higher profit for chisel plow followed by disc harrow then disc plow and minimum tillage. CWR + 20%L.F. and chisel plow treatment resulted in higher profit than the other combination of treatments.