Effects of Nitrogen, Phosphorus and Potassium Levels on Kenaf (Hibiscus cannabinus L.) Growth and Photosynthesis under Nutrient Solution

Abstract

To date, little is known about the effect of levels of nitrogen, phosphorus and potassium on kenaf grown in nutrient solution culture. The objective of the present study was to examine the effects of different nitrogen, phosphorus and potassium levels on kenaf growth such as diameter, plant height, leaf number, root dry weight, stem dry weight and leaf dry weight and physiology like chlorophyll content, photosynthesis and stomatal conductance. Treatment consisted of 5 different levels of nitrogen viz. 0, 50, 100, 200 and 400 mg/L and 5 different levels of phosphorus and potassium viz. 0, 25, 50, 100 and 200 mg/L replicated thrice in a completely randomized design in a shade house. Growth (diameter, plant height and leaf number), chlorophyll content and photosynthesis were measured once weekly and plant components biomass was measured, 28 DAT. Different levels of nitrogen, phosphorus and potassium had significant effects on all the parameters studied. The highest values for diameter, plant height, leaf number, root dry weight, stem dry weight, leaf dry weight, photosynthesis and stomatal conductance were obtained from 200N, 100P and 100K whereas values decreased with further increase in levels of nutrient concentration. All the growth rates, chlorophyll content and photosynthesis declined with lower level of nitrogen, phosphorus and potassium. Among the plant components, leaf dry weight had the greatest decrease while root/shoot ratio increased under N deficiency. The results of this study provide new knowledge to produce kenaf with better nutrient management in the field.

Effect of Nutrient Deficiencies on Growth of Gerbera through Solution Culture

“…Nitrogen is mobile and translocates from older to younger leaves, which resulted in severe defoliation and reduced leaf number. Similar reduction in leaf number due to deficiency of nitrogen was observed in Spathyphyllum (Yeh et al, 2000) and Hibiscus (Hossain et al, 2010). Reduction in leaf area in N deficient plants is due to poor carbon assimilation as N is a major part of the chlorophyll molecule and is necessary for photosynthesis (Uchida, 2000).…”

“…Therefore, N deficiency results in poor growth and development (Uchida, 2000), which had resulted in reduced plant height, similar reduction in plant height due to nitrogen deficiency was observed in Gerbera (Jeong et al, 2009) and in Hibiscus (Hossain et al, 2010). Nitrogen is mobile and translocates from older to younger leaves, which resulted in severe defoliation and reduced leaf number.…”

Nutrients Reclamation using Modified Membrane to Provide Added Value to the Kenaf Retted Wastewater

“…It can thus be concluded that, this modified membrane is efficient in the reclamation of TN, TP and K from KRW. Table IV shows the nutrients reclaimed from a hectare kenaf plantation only produce 12.58 kg/L/ha of TN, 6.77 kg/L/ha of TP and 172.64 kg/L/ha of K which considered as low compared to the study made by Hossain et al [1] for maximum growth and photosynthesis rate, kenaf plant need the nutrient rate of 200 kg/ha of N, 100 kg/ha P and 100 kg/ha of K. Although amount of nutrient reclamation from KRW is seen only little from the fertilizer used for kenaf plantation and just potassium is able to meet the basic needs of kenaf, but from the point of a whole Malaysia production view, it is found that this method was able to reclaim its original nutrients from the water kenaf waste in large quantities. [1] 200 kg/ha 100 kg/ha 100 kg/ha…”

“…Kenaf planting has been increased around the world due to its high biomass yield and the raised fiber content [1]. As reported by the Utusan Malaysia [2], total of 10 hectares of land in Malaysia is used for the cultivation of kenaf per season.…”

EFECTO DEL USO DE TUTORES Y APLICACIÓN DE BIOFERTILIZANTES EN EL CRECIMIENTO Y DESARROLLO DE Plukenetia volubilis L. “SACHA INCHI”

“…La escasez de nitrógeno, fósforo, potasio y agua se convierte en una limitante para el crecimiento, desarrollo y rendimiento económico de los cultivos (Parry et al 2005). El limitado suministro de N, P y K disminuye la tasa de división celular, la expansión celular, la permeabilidad celular (Hossain et al 2010), la fotosíntesis, la producción de hojas, el crecimiento (Chapin 1980;Clarkson & Hanson 1980;Evans 1972;Zhao et al 2003Zhao et al , 2005, y el rendimiento, como sucedió con los tratamientos T6 y T12, en los que se obtuvieron bajos resultados, como se muestran en la tabla 5 de la prueba de Duncan (p < 0.05).…”