Interactive Effects of Nitrogen and Potassium Fertilization on Oxalate Content in Napiergrass (Pennisetum purpureum)

Abstract

Ingestion of forage containing a large quantity of soluble oxalate can result in calcium deficiency and even death of livestock. Fertilization is one of the most practical and effective ways to improve yield and nutritional quality of forage. An experiment was conducted to determine the effects of nitrogen (N) fertilization (150, 300 and 600 kg/ha) across varying levels (150, 300 and 600 kg/ha) of potassium (K) on oxalate accumulation in napiergrass (Pennisetum purpureum). Application of N at 300 kg/ha produced higher dry matter yield than at 150 or 600 kg/ha, while K fertilization had no effect on yield. In general, N fertilization did not affect the soluble and total oxalate contents, but slightly affected the insoluble oxalate content. Soluble oxalate content showed an increasing trend and insoluble oxalate content showed a decreasing trend with increasing K level, but total oxalate content remained relatively constant. There were significant interactions between N and K fertilization for the content of soluble and insoluble oxalate fractions. The greatest increase in soluble oxalate content with N level at 300 kg/ha was found at the high level (600 kg/ha) of K application. The greatest increase in insoluble oxalate content with N level at 600 kg/ha was found at the low level (150 kg/ha) of K application. These results indicated the possibility of controlling the content of soluble and insoluble oxalate fractions in forage by fertilization.

In vitro gas production, in vivo nutrient digestibilities, and metabolisable energy concentrations for sheep of fresh and conserved pangola grass

“…Characteristics of Napier grass in this study, especially its CP content were similar to values reported by Tamada et al (1999) and Rahman et al (2009). Characteristics of fresh pangola grass in this study indicated a high forage quality when compared with previous reports (Animal Nutrition Division, 2006;Chaichaum et al, 2007;Chaiwang et al, 2011;Lee et al, 2000) and a similar trend was noted for pangola hay.…”

“…This might be due to the differences in stage of cutting, location, climate and environment. Rahman et al (2009) reported that the CP content of Napier grass varies with many factors, such as plant maturity and nitrogen fertilization. The CP content of fresh pangola was lower than the average of 100 g/kg DM reported by Animal Nutrition Division (2002) but similar to values reported by Chaichaum et al (2007;81 g/kg DM) and greater than 79, 63 and 53 g/kg DM reported by Animal Nutrition Division (2006), Mullik et al (2009) andChaiwang et al (2011), respectively.…”

Differences in the nutritional quality of improved finger millet genotypes in Ethiopia

“…Similar studies on oxalate concentrations in finger millet reports values ranging from 0.2 to 0.26 mg g -1 (n = 10 genotypes) 29 . The present study shows higher oxalate concentration which could arise for many reasons including: synergetic and antagonistic effect on oxalate from N and P, respectively 35 . Season/temperature also reported to influence oxalate accumulation 36 .…”

Effects of different cutting height and nitrogen levels on the forage yield and quality of giant kinggrass (Pennisetum hybridum)

“…Bitkilere uygulanan N miktarı belirli bir seviyeye kadar arttıkça, biyokütle veriminin yükseldiği, verilen miktarın daha da arttırılması durumunda toksik etki nedeniyle verim düşüşleri ve hatta ölümlerin başladığı birçok araştırıcı tarafından dile getirilmiştir (Tessema et al, 2002(Tessema et al, -2003Wadi et al, 2004;Ullah et al, 2010). Japonya ekolojik koşullarında, P. purpureum bitkisinde farklı azot (15, 30, 60 kg N/da) ve potasyum (15, 30, 60 kg K/da) seviyelerini araştıran Rahman et al (2010), dekara 15 kg N dozunda 4.88 t/ha olan KM veriminin, 30 kg N uygulamasında 6.02 t/ha yükseldiğini, 60 kg N uygulamasında ise 5.38 t/ha'a gerilediğini bildirmişlerdir. Diğer taraftan, Pakistan ekolojik koşullarında P. purpureum bitkisine farklı azot (0, 4, 8, 12 kg N/da) uygulayan Ullah et al (2010), kontrole göre artan N seviyeleri karşısında KM verimlerinin sırasıyla 1.2, 1.7, 2.0 ve 2.0 t/ha'a yükseldiğini vurgulamışlardır.…”