Different Nitrogen Sources Affect Biomass Partitioning and Quality of Potato Production in a Hydroponic System

Controlled release urea improved the nitrogen use efficiency, yield and quality of potato (Solanum tuberosum L.) on silt loamy soil

“…Plant samples except for one part of potato tuber, which was brought back from field, were dessicated at 105 • C for 30 min and oven-dried at 70 • C in a forced air circulation oven until a constant weight was reached (Silva et al, 2013) and ground to pass a 2 mm sieve (Zebarth et al, 2012). The total N concentration of plant was determined by H 2 SO 4 -H 2 O 2 digestion and the micro-Kjeldahl procedure (Douglas et al, 1980).…”

“…Urea is an ordinary fertilizer that is widely used across the whole world, and this compound can stimulate biomass and total nitrogen accumulation in potatoes (Silva et al, 2013). Potatoes require high nitrogen inputs to maximize yields, and yet fertilizer N recovery is often relatively low (<50%) because of the plant's shallow root system (Liegel and Walsh, 1976;Bundy and Andraski, 2005).…”

Moderate ammonium:nitrate alleviates low light intensity stress in mini Chinese cabbage seedling by regulating root architecture and photosynthesis

“…However, there are some ammonium-preferred plants such as rice, having a higher capacity of ammonium assimilation than other plant species (Guo et al, 2007a,b). It has been reported in previous studies that different nitrogen sources could clearly affect growth, yield and quality of many plant species by affecting nitrogen and water-use efficiency (Yin and Raven, 1998), nitrogen metabolism (Tabatabaei et al, 2008), mineral nutrient absorption (Helali et al, 2010;Serna et al, 1992), hormone content (Lu et al, 2009), biomass partitioning (Silva et al, 2013), and photosynthesis (Guo et al, 2006;Tabatabaei et al, 2006). Not only plant shoot growth but also root proliferation may be affected by different nitrogen forms.…”

Cumulative release characteristics of controlled-release nitrogen and potassium fertilizers and their effects on soil fertility, and cotton growth

“…All the plant above the root from each pot was sampled, separated them into vegetative organs (stem, leaves and branches), reproductive organs (buds, flowers and bolls), and enveloped them separately. Samples were put into an electric oven for a quick cell killing at 105 °C for 30 min and oven-dried at 85 °C until a constant weight reached before weighed50. Plant samples were digested by H 2 SO 4 -H 2 O 2 mixture and the total N and K concentration of plant were determined by the micro-Kjeldahl procedure and a flame photometer51.…”