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M. Murshidul Hoque, Husein Ajwa, Mona Othman, Richard Smith, and Michael Cahn

extractable P (Olsen test), which is the recommended soil P level for cool-season vegetables ( Smith et al., 2006 ). Optimal fertilizer management and efficient use of N, P, and potassium (K) are necessary to improve yield and quality and to reduce

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Yang Chen, Xianzhi Zhou, Yongsheng Lin, and Lina Ma

Xiahua Industrial Co. Ltd., Xiamen, Fujian Province, China), and potassium sulfate [K 2 O ≥ 50%; Qingshang Chemical (Xiamen) Co. Ltd, Xiamen, Fujian Province, China], respectively. Experimental method. The experiment was performed using the Longxun

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E. F. Brown and F. A. Pokorny

Abstract

Potassium concentration was highest in the upper 5 cm of medium after leaching with 10 cm H2O, lowest in the middle of the soil column (10 and 15 cm depths), and intermediate at the bottom of the column. Increasing concentrations of applied K (336, 671, and 1007 kg/ha) increased the K level in each medium tested, except 100% sand, and at each depth in the soil column. After leaching, media containing high percentages of sand (75 and 100%) had a lower K concentration at all applied K rates than media containing high percentages of bark (0 and 25% sand). Cation exchange capacity was greater in bark than sand and is probably the most important factor influencing the movement of K in pine bark and sand media.

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Robert L. Mikkelsen

Potassium (K) is an essential nutrient for plant growth, but it generally receives less attention than nitrogen (N) and phosphorus (P) in many crop production systems. Many regions of the United States and all of the Canadian provinces remove more K

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Xiaofeng Yang, Lianzhu Chen, Ming Cao, Xuebin Zhang, and Shaopeng Li

The growth and development of vegetables require a large amount of nitrogen and potassium ( Balliu and Bro, 2002 ; Hebbar et al., 2004 ). Potassium application and its balanced relative ratio to nitrogen are the most important for the crop

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Yin-Tung Wang

Compared with fruit and vegetable crops, the effects of potassium (K) on growth and performance of ornamental and floral crops have not been studied as extensively. K deficiency is a widespread disorder on many palm species worldwide ( Chase and

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Wei Hu, Qing Di, Jingyi Wei, Jie Zhang, and Jia Liu

there was no significant difference in photosynthetic CO 2 response between the grafted plants and the control plants when the tomato leaves were measured during the flowering period ( Zhang and Guo, 2019 ). Potassium cannot only promote the synthesis

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Katherine Kreuser, William C. Kreuser, Gautam Sarath, and Keenan L. Amundsen

coat enabling gas and water exchange. Fig. 5. Sundancer buffalograss burs spliced in half following a ( A ) 24-h water soak, ( B ) 48-h water soak, ( C ) 24-h 0.05 m potassium nitrate (KNO 3 ) soak, and ( D ) 48-h 0.05 m KNO 3 soak indicating the

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Changwei Shen, Yifei Ding, Xiqiong Lei, Peng Zhao, Shuo Wang, Yangchun Xu, and Caixia Dong

). Regarding the total amount of mineral nutrients required by plants, potassium is required in the largest amount after nitrogen (N) ( Zörb et al., 2014 ); moreover, it is the largest nutrient required by the fruit ( Lester et al., 2006 ; Mpelasoka et al

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Xiaoya Cai, Laurie E. Trenholm, Jason Kruse, and Jerry B. Sartain

of growth regulators ( Harivandi and Gibeault, 1997 ; Qian and Engelke, 1998 ). Potassium has been shown to enhance turfgrass resistance to biotic and environmental stresses ( Turner and Hummel, 1992 ). It can additionally aid in the production of