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King Abdulaziz University (2013)

RESPONSE OF SQUASH CROP TO SULPHUR AND POZZOLAN AS SOIL CONDITIONERS UNDER DIFFERENT IRRIGATION WATER SALINITY LEVELS

Siswoyo, Wakid Mutowal

Titre : RESPONSE OF SQUASH CROP TO SULPHUR AND POZZOLAN AS SOIL CONDITIONERS UNDER DIFFERENT IRRIGATION WATER SALINITY LEVELS

Auteur : Siswoyo, Wakid Mutowal

Université de soutenance : King Abdulaziz University

Grade : Master 2013

Résumé
Production of vegetable crops under dry land condition like that prevail in the western part of Saudi Arabia is faced by many problems such as scarcity of irrigation water, low irrigation water quality, high salinity of water and soil, and poor soil fertility. One of the recommended method to improve the production under these conditions is using sulphur amendment and pozzolan to enhance soil fertility and soil physical parameters especially soil moisture. The main aim of this research was to improve the squash yield and quality using sulphur and pozzolan as soil conditioners under different irrigation water salinity levels. The experiment was conducted at the Agriculture Experimental Station of King Abdulaziz University during two successive seasons of winter and spring (2012 and 2013). The experiment was laid on split split plot design with three replications. The main plot included three irrigation water salinity levels (IWSL) (1200, 3000, and 6000 mg L-1), the sub plots comprised four pozzolan placements (PP) (surface, 10 cm depth, 20 cm depth, and without pozzolan) while the sub sub plot included three sulphur amendment levels (SAL) (0, 4, and 6 ton ha-1). The measured parameters are squash yield and quality, water use efficiency (WUE) and some soil chemical characteristics. Results indicated that, decreasing IWSL from 6000 to 1200 mg L-1 increased squash yield and WUE from 10.56 to 24.47 ton ha-1 and 66.10 to 153.14 kg mm-1 ha-1 in winter and from 10.95 to 22.14 ton ha-1 and 69.93 to 141.31 kg mm-1 ha-1 in spring respectively. However, it decreased total soluble solid (TSS) and vitamin C from 3.94 to 3.48% and 5.98 to 5.07% in winter and from 3.70 to 3.24% and 5.58 to 4.68% in spring respectively. PP in the soil surface increased squash yield and WUE from 12.70 to 22.61 ton ha-1 and 79.43 to 141.45 kg mm-1 ha-1 in winter and from 11.23 to 20.50 ton ha-1 and 71.73 to 130.90 kg mm-1 ha-1 in spring compared with no pozzolan treatment respectively. On the other hand, it decreased TSS and vitamin C respectively from 4.20 to 3.08% and 6.61 to 5.77% in winter and from 3.89 to 2.88% and 6.11 to 3.89% in spring respectively. Increasing SAL from 0 to 6 ton ha-1 increased squash yield and WUE from 8.91 to 28.30 ton ha-1 and 55.72 to 177.05 kg mm-1 ha-1 in winter and from 8.60 to 24.73 ton ha-1 and 54.90 to 157.89 kg mm-1 ha-1 in spring respectively. However, it decreased TSS and vitamin C respectively from 4.14 to 3.39% and 6.53 to 4.66% in winter and from 3.87 to 3.16% and 6.07 to 4.32% in spring. Application of PP in the soil surface and 6 ton ha-1 of SAL under 1200 mg L-1 of IWSL increased squash yield and WUE from 6.95 to 49.74 ton ha-1 and 43.46 to 311.19 kg mm-1 ha-1 compared with control treatment (no pozzolan, no sulphur and 6000 mg L-1 of IWSL) in winter. In addition, it increased squash yield and WUE from 8.76 to 43.55 ton ha-1 and 55.91 to 278.06 kg mm-1 ha-1 in spring season. Decreasing IWSL from 6000 to 1200 mg L-1 increased soil nitrogen (N), phosphorus (P), potassium (K), and organic matter (OM). The increases were from 618 to 704 mg kg-1, 39.35 to 47.59 mg kg-1, 0.87 to 0.92%, and 0.3421 to 0.3586% respectively. On the other hand, it decreased soil pH and electric conductivity (EC) from 7.47 to 7.07 and 4.14 to 1.90 dS m-1 respectively. PP in the soil surface increased N, P, K, and OM respectively from 549 to 794 mg kg-1, 33.20 to 53.91 mg kg-1, 0.79 to 0.93%, and 0.3401 to 0.3684% but decreased soil pH and EC from 7.57 to 7.23 and 2.72 to 2.27 dS m-1 respectively compared with no pozzolan treatment. Increasing SAL from 0 to 6 ton ha-1 increased soil N, P, K, and OM from 620 to 672 mg kg-1, 38.09 to 49.21 mg L-1, 0.84 to 0.96 %, and 0.3521 to 0.3662% respectively but decreased soil pH and EC from 7.49 to 7.14 and 5.06 to 2.15 dS m-1 respectively.

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Page publiée le 23 décembre 2014, mise à jour le 7 décembre 2017