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

Abstract

A filed experiment was carried out during the two successive seasons of 2016/2017 to study the effect of planting date (20 th September (Sep.) and 10 th 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 composition of 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 10 th 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 20 th 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. FAWZY MANSOUR & HANAN ABU EL-FOTOHConclusively, under similar conditions it could be concluded that , the tertiary interaction of planting on 10 th 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.

Growth, Chlorophyll, Yield and Tubers Chemical Composition, and Quality Characters of Potato Cv. Spunta as Affected by Planting Dates and Irrigation Regimes

“…Under the climatic conditions of this experiment, the irrigation requirements of potato must not be decreased the at all planting dates because the rainfall in this period cannot reinforce the irrigation regime of potato plants with considerable quantities of water which supposed to complete with irrigation (Table 1). Moreover, the obtained experiment results came to the harmony with those of Maralian et al (2017); Mansour and Abu El-Fotoh (2018); Ali et al (2019) and Meligy et al (2020) who showed that that the 100% of irrigation requirements gave the highest mean values of plant growth and chlorophyll content.…”

“…The effect of planting dates and irrigation regimes on chemical composition of potato was also reported by Nunes et al (2006); Mansour and Abu El-Fotoh (2018); Ali et al (2019) and Mankotia and Sharma (2020). Moreover, it could be noticed that the increment percentages of most of studied characters due to IR100% were found to be higher than those of due PD1, which could be due to the vital and well-known role of availability of soil moisture for increasing absorbtion by plant roots (Marschner and Rengel, 2011).…”

“…These findings refer to that the planting date significantly affected the growth parameters of potato plants and the planting date of 1 st December (PD1) is the most suitable planting date more than the ordinary planting date of 15 th December (PD2). Many other researchers stated the effect of planting dates on growth attributes (Thongam et al, 2017;Mansour and Abu El-Fotoh, 2018;Patel et al, 2018;Meligy et al, 2020). However, the exact planting date is strongly related to the geographical location.…”

“…The well-known agriculture practices that subjected to modification due to the climatic changes are planting dates and irrigation requitements (Kang et al, 2009); especially, the planting dates of potato and other crops (Hijmans, 2003;Sacks et al, 2010). There were many literatures discussed the different effects of planting date on the performances of many crops, particularly potato (Ezekiel and Bhargava, 1992;Mansour and Abu El-Fotoh, 2018;Muhammad et al, 2018;Patel et al, 2018). It could be concluded from these studies that the significance of the effect of potato planting date is related to the geographical location in which the experiment is carried out in addition to the used potato cultivar(s).…”