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A filed experiment was carried out during  the two  successive seasons  of 2016/2017 and 2017/2018 at the Experimental Farm of El- Gemmeiza, Agric Res. Station, A. R.C., Gharbya Governorate  (Middle Delta, Egypt) to study the effect of planting date (20th September  (Sep.) and 10th October (Oct.),  irrigation water level at  50, 75 and 100 %  from the filed capacity (FC) and  two  foliar  spray treatments with calcium chloride (1%) and boron  ( 60 ppm) singly or in combinations,  beside  unsprayed treatment as well as their interactions on growth, plant water relationship and plant chemical compositionof potato(Mondial  cv.)  under clay  soil conditions using flood irrigation system. These treatments were arranged in a split split plot design with three replicates. Planting date was arranged in the main plots, irrigation water quantities were in the sub plots, while foliar spray treatments were randomly distributed in the sub sub plots. The obtained results indicate that, the tertiary interactions of  planting on 10th Oct., irrigation  at  100 %  of FC and spraying  potato plants with  calcium and boron in combination  gave the highest values of plant height , both fresh and dry weight of shoot/ plant, total  and free water % as well as total chlorophyll ( a+b)  in leaf tissues, N, P, K, Ca ,  Boron and  total carbohydrates contents in shoots in both seasons. While the tertiary  interactions of planting on 20th Sep., irrigation level at 50 % from FC and unsprayed with calcium and boron gave the   highest values of bound water % and proline amino acid in  leaf tissues in both seasons. Conclusively,  under similar conditions it could be concluded that , the tertiary interaction of planting  on 10th Oct , irrigation  at 100 % FC  and  sprayed plants  with Ca + B were the best interaction treatments  for enhancing plant growth  and chemical constituents in shoot  of  potato  grown  in  clay soil under the same conditions.

journal of productivity and development/journal of productivitiy and development

EFFECT OF PLANTING DATE , IRRIGATION LEVEL AND FOLIAR SPRAYING WITH CALCIUM AND BORON TREATMENTS ON POTATO 1. PLANT GROWTH , PLANT WATER RELATIONSHIP AND PLANT CHEMICAL CONSTITUENTS