Nutrient distribution across wheat rhizosphere with oxamide and ammonium sulfate as N source

Abstract

Analysis of the behavior of slow releasing nitrogen fertilizers in the rhizosphere soil of agricultural crops is essential for their effective use. This work presents a comparative study of the effects of oxamide and ammonium sulfate as different N sources on the relative mobility of some nutritionally important anions and cations and their relevance to plant growth, root development, and pH distribution pattern in the rhizosphere of wheat (Triticum aestivum cv. Nourin No. 61). Experiment was conducted on a Japanese upland alluvial soil through a rhizobox approach. In the central compartment (CC) of the oxamide and ammonium sulfate treated rhizoboxes, four uncontaminated and homogeneous wheat seedlings germinated on a sterile petridish were grown for nearly two months. During the growing period plant height was recorded weekly. After the growing period, rhizoboxes were dismantled for soil sampling and photography of roots. Soil samples from each compartment of the two rhizoboxes were used for the analysis of CI-, N0 3-, SO.2-, Ca 2 +, MgH, K+, NH. +-N, N0 3-N and measurement of pH. Compared with ammonium sulfate, the distribution of anions and cations from the distant compartments to the central ones over a distance of 3-5 mm along with a better plant growth, high rooting density, and high pH confirmed that oxamide was an efficient nitrogen fertilizer.

Effect of application of inorganic and organic fertilizers on the dynamics of soil nutrients in the rhizosphere

“…Fertilizers are divided into inorganic and organic ones in their chemical forms. By the application of inorganic fertilizers, the concentrations of available nutrients in the rhizosphere often became higher than those in the non-rhizosphere (Okajima and Taniyama 1980;Lee et al 1997;Miah et al 1998). Besides inorganic fertilizers, organic fertilizers have been utilized for a long period of time.…”

Short Term Red Amaranth Growth With Urea as N Source

“…Determined by the methods of Miah et al (1998), the soil characters of the experimental site were silty clay loam having a pH (5.5), total nitrogen (0.054%) and organic matter (1.38%). The experiment was laid out in a Randomized Complete Block Design (RCBD) comprising the treatment combinations T 0 (No nitrogen), T 1 (50 kg N ha -1 ), T 2 (75 kg N ha -1 ), T 3 (100 kg N ha -1 ), T 4 (125 kg N ha -1 ), T 5 (150 kg N ha -1 ) with urea as N source and replicated four.…”

Nutrient accumulation and their uptake by red amaranth as influenced by different levels of N

“…Eight plants were randomly selected from each plot to study the nutrient accumulation and their uptake. N, P, K, Mg, S, and Zn contents in red amaranth were determined (Miah et al, 1998) at soil chemistry laboratory of BSMRAU using AAS (Model Z-9000, Hitachi Co., Japan). Nutrient uptake was calculated from nutrient contents and dry matter yield and statistical analyses were performed by the method of Gomez and Gomez (1984).…”

“…So the trend of Mg uptake in red amaranth of the current experiment was corroborated by the findings of Kirkby and Mengel (1976). However, it remained to be studied whether the application of increased N levels had a positive effect on Mg uptake or not since the crop was grown only for one season which is not enough to conclude on plant nutrient uptake (Miah et al, 1998).…”