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
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
has become a key factor limiting the production of high-quality container plants. Nitrogen (N), phosphorus (P), and potassium (K) are key factors that regulate plant growth. These three nutrients have crucial effects on plant growth and development
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.
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
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
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
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
Florida ranked first nationally in fresh market tomato ( Solanum lycopersicum L.) production with 13,030 ha harvested and a total value of US $453 million in 2015 ( U.S. Department of Agriculture, 2016) . Potassium is an essential element in tomato
Differential growth and quality responses to potassium (K) have been reported for foliage plants. Potassium deficiency is a widespread disorder on many palm species worldwide ( Chase and Broschat, 1991 ). Under conditions of K deficiency, K from