Effect of Planting Date, Irrigation Level and Foliar Spray With Calcium and/or Boron on Potato Crop Performance 2. Yield and Its Components, Cracking Phenomenon and Tuber Quality

Abstract

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, ARC, Gharbiya Governorate (Middle Nile Delta, Egypt) to study the effect of planting date (20 th September (Sep) and 10 th October (Oct), irrigation water level at 50, 75 and 100 % of filed capacity (FC) and two foliar spray with Ca (1%) as calcium chloride and/or boron (60 ppm) as boric acid besides unsprayed treatment (control), and their interactions on yield and its components, tuber cracking and tuber quality under clayey soil conditions using flood irrigation system. The adopted treatments were arranged in a split -split plot design with three replicates. The planting dates were arranged in the main plots, irrigation water quantities were arranged in the sub plots, while Ca and/or B foliar sprays were randomly distributed in sub -sub plots.The obtained results indicate that, the tertiary interaction of planting on 10 th Oct. , irrigation at 100% FC and sprayed plants with Ca + B resulted in higher values of total tuber yield, average tuber weight , number of tuber № plant -1 , tuber yieldplant -1 ,N, K, Ca and B contents and DM percentages in 1 st and 2 nd seasons. Total carbohydrates were the highest with the interaction of planting on 10 th Oct. and irrigating at 100 %FC and sprayed plants with B. The increases in total tuber yield were about 253.75 and 177.82 % for tertiary interaction of planting on 10 th Oct , irrigation at 100% FC and sprayed with Ca + B over the interaction of planting on 20 th Sep , irrigation with 50%FC and unsprayed plants, in the 1 st and 2 nd 38 FAWZY MANSOUR & HANAN ABU EL-FOTOH seasons, respectively. As for tuber cracking %, the lowest values were obtained with the tertiary interaction of planting on 10 th Oct, irrigation with 75 %FC and sprayed with Ca + B (11.37 and 10.41 %) in the 1 st and 2 nd seasons, respectively, while the highest values were obtained with the tertiary interaction of planting on 20 th Sep, irrigation at 100 %FC and without Ca and B (25.38 and 26.57 % in the 1 st and 2 nd seasons, respectively).Conclusively, 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 was superior for enhancing both total tuber yield and quality. Furthermore, on reducing tuber cracking, combination of planting on 10 th Oct, irrigation at 75% FC and spraying the plants with Ca + B is recommended.

Effect of Foliar Spray with Calcium and some Antioxidants on Growth, Yield and Yield Quality of Potato

“…The highest values of N, P and K were obtained by spraying calcium at level of 2000 ppm with spraying boric acid compared with the other treatments. These results are in accordance with those obtained by Mansour and Abu El-Fotoh (2019).…”

“…These results may be related to the important roles of boron in improves calcium absorption and stabilizes calcium in cell wall, sugar transport, cell division, cell development and synthesis of amino acids and proteins (Mengel and Kirkby, 1978). These results coincide with those of Chowdhury (2017), Simango and Walls (2017), Tantawy et al (2017) and Mansour and Abu El-Fotoh (2019) they found that spraying potato plants with calcium or boron singly or in combination gave the higher yield as well as yield components than that of plants which sprayed with calcium or boron singly.…”

“…These results are in harmony with those of El-Hadidi et al, (2017) they found that at harvest, tubers content of N, P, K, Ca and Mg increased significantly with foliar application of Ca up to Ca2 (0.8 % Ca) and spraying with Mg up to level Mg1 (0.2 % Mg). Similarly, reported by Mansour and Abu El-Fotoh (2019).…”