Comparison between Organic and Mineral Sources of Potassium and Their Effects on Potassium Fractions in Clay Soil and Productivity of Potato Plants under Water Stress Conditions
Shaimaa H. Abd-Elrahman; Noura M. Taha;
Abstract
POTASSIUM within its cells. Different forms of K were investigated for their effects on potato ( (K) is an essential element for plant growth that maintains water balance Solanum
tuberosum, cv. Spunta) plants grown under water stress conditions as a kind of adaptation
to the climatic changes and water shortage under Egyptian soil conditions. Also, knowledge
of different K fractions in the studied clay soil is important to achieve the sustainability in
agriculture. Therefore, a feld experiment was conducted during the two tested seasons of years
2014 and 2015 at the Faculty of Agriculture, Ain Shams University, Qalubia governorate,
Egypt. Two sources of K were tested under three levels of irrigation water in a split-plot design.
Results indicated that K fractions in soil were in order of total K > non-exchangeable/ fxed
> exchangeable > water soluble. The 50% irrigation level of irrigation requirements (IR)
combined with K-humate as ground application increased water soluble and exchangeable K
in the studied soil. While there was hardly no changes observed due to the applied treatments
on fxed and total amounts of K in the soil. Regarding the studied vegetative growth and yield
parameters of the growing potato plants, the treatment 100% of IR combined with K-humate
as soil application caused signifcant increases. The specifc gravity of tuber, as an important
indicator of potato tuber quality, recorded the highest value by applying 50% of IR combined
with K-humate as ground addition, compared to mineral addition which came in the second
order. Regarding the nutrient concentrations in potato haulm, results revealed that the 50%
of IR combined with K-humate gave the highest content of N, while the same irrigation level
with K-humate plus foliar spray gave the highest content of P and K, during the two tested
seasons. In tubers, 50% of IR combined with K-humate as soil application gave the highest
concentration of N and P during the two tested seasons, while 75% of IR in the frst season and
50% of IR in the second season combined with K-humate plus foliar spray gave the highest
values of K content. The calculated water use effciency (WUE) showed that the highest value
was obtained by 50% irrigation level of IR combined with soil application of K-humate
tuberosum, cv. Spunta) plants grown under water stress conditions as a kind of adaptation
to the climatic changes and water shortage under Egyptian soil conditions. Also, knowledge
of different K fractions in the studied clay soil is important to achieve the sustainability in
agriculture. Therefore, a feld experiment was conducted during the two tested seasons of years
2014 and 2015 at the Faculty of Agriculture, Ain Shams University, Qalubia governorate,
Egypt. Two sources of K were tested under three levels of irrigation water in a split-plot design.
Results indicated that K fractions in soil were in order of total K > non-exchangeable/ fxed
> exchangeable > water soluble. The 50% irrigation level of irrigation requirements (IR)
combined with K-humate as ground application increased water soluble and exchangeable K
in the studied soil. While there was hardly no changes observed due to the applied treatments
on fxed and total amounts of K in the soil. Regarding the studied vegetative growth and yield
parameters of the growing potato plants, the treatment 100% of IR combined with K-humate
as soil application caused signifcant increases. The specifc gravity of tuber, as an important
indicator of potato tuber quality, recorded the highest value by applying 50% of IR combined
with K-humate as ground addition, compared to mineral addition which came in the second
order. Regarding the nutrient concentrations in potato haulm, results revealed that the 50%
of IR combined with K-humate gave the highest content of N, while the same irrigation level
with K-humate plus foliar spray gave the highest content of P and K, during the two tested
seasons. In tubers, 50% of IR combined with K-humate as soil application gave the highest
concentration of N and P during the two tested seasons, while 75% of IR in the frst season and
50% of IR in the second season combined with K-humate plus foliar spray gave the highest
values of K content. The calculated water use effciency (WUE) showed that the highest value
was obtained by 50% irrigation level of IR combined with soil application of K-humate
Other data
Title | Comparison between Organic and Mineral Sources of Potassium and Their Effects on Potassium Fractions in Clay Soil and Productivity of Potato Plants under Water Stress Conditions | Authors | Shaimaa H. Abd-Elrahman; Noura M. Taha | Keywords | Productivity of potato plants;Irrigation water levels;Potassium humate;Potassium sulphate;Ground application;Foliar application | Issue Date | 1-Jan-2017 | Journal | Egyptian Journal of Soil Science | Volume | 58 | Issue | 2 | Start page | 193 | End page | 206 | DOI | DOI: 10.21608/ejss.2018.2752.1153 |
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