Effect of deficit irrigation and potassium fertilization on quantity and quality of Giza 95 cotton plants

Abstract

seasons to study the response of cotton to potassium fertilization (12, 24, 36 and 48kg K 2 O) as soil application as well as 5kg K 2 O/ fad as foliar spraying three times at squaring, beginning of flowering and top of flowering) under different irrigation intervals at recommended irrigation interval (every 12 days), every 15 days, every 18 days and every 21 days). The results show that increasing potassium fertilization up to 36kg or 48kg K 2 O/fad as soil application as well as decreasing irrigation interval to 12 days exhibited the highest values of plant height, number of fruiting branches/ plant, number of open polls/plant, seed cotton yield, earliness % and seed index as well as leaf content of N, K, chlorophyll A and B and carotenoids. On the other hand, lint percentage and fiber properties did not respond to either potassium or irrigation treatments, while P content increased as increasing water irrigation. Increasing both potassium levels and the irrigation intervals improved water use efficiency and water utilization efficiency. The results of the interaction between potassium and irrigation treatments reveal that irrigation cotton plants every 15 days when fertilized with 48kg K 2 O/fad as soil application produced highest growth, yield and its components and chemical content of cotton leaf equal to these irrigated every 12 days and supplied water 36 or 48kg K 2 O/fad.

Supplemental Foliar Applied-Potassium Induces Tolerance to Water Deficit in Cotton Plants

“…In this concern, Abd El-Gayed and Bashandy (2018) mentioned that the decrease in applied water efficiency resulting from decreasing the intervals between irrigation is mainly due to loss of water by leaching. These results are in line with those obtained by Abd El-latif et al (2016) andBashandy (2018).…”

Response of Plant Rhizosphere Microenvironment to Water Management in Soil- and Substrate-Based Controlled Environment Agriculture (CEA) Systems: A Review

“…Potassium is another primary nutrient required by plants. K is found within plant cell solutions and is used for maintaining the turgor pressure of the cell (meaning it keeps the plant from wilting) ( Abd El-Mageed et al, 2017 ; Abd El-Gayed and Bashandy, 2018 ). In addition, K plays a role in the proper functioning of stomata (cells located at the bottom of leaves that open and close to allow water vapor and waste gases to escape) and acts as an enzyme activator ( Xu et al, 2020 ).…”