Estimating the spatial variability of various plant parameters during the growing season can assist in timely correction of stress conditions within a field. This research illustrates that the nitrogen reflectance index (NRI) developed to estimate plant nitrogen status can be used to estimate plant parameters and yield potential. The study was conducted on two experimental maize sites. Selected...

Atmospheric nitrogen (N) deposition, an important component in the global N cycle, has increased sharply in recent decades in China. Here, we constructed national-scale inorganic N wet deposition (Ndep) patterns in China based on data from 280 observational sites and analysed the effects of anthropogenic sources and precipitation on Ndep. Our results showed that the mean Ndep over China increas...

Although Uganda has poor soils with low organic matter, fertiliser is not widely adopted, especially by female-headed households. Thus we examine the role of gender in inorganic fertiliser adoption using a national household survey. We estimate separate models for femaleand male-headed households to ascertain if the drivers of adoption differ by gender. With respect to male-headed households, w...

Abstract Aims High nitrogen (N) fertiliser inputs in intensive sugarcane systems drive productivity but also significant emissions of nitrous oxide (N 2 O), a potent greenhouse gas. Fertiliser and soil N availability for both plant uptake O across different rates remain unknown, hindering efficient management. This study investigated the contribution their interaction to two intensively managed...

Context Optimising nitrogen (N) management strategies for drill-sown rice crops is essential minimising input costs growers and reducing the environmental impact of production. Aims The study aimed to determine recovery fertiliser-N in Australian crops, following current N fertiliser recommendations where two-thirds applied at sowing (pre-flood) one-third panicle initiation. Methods 15N-labelle...

Managing uncertainty and risk is an increasing challenge for running profitable grazing systems. There is continual pressure to increase efficiency and productivity, while at the same time there is mounting scrutiny of the impact of grazing systems on the environment. Of particular interest is the impact of nitrogen and phosphorus losses from grazed pasture systems to water and the atmosphere. ...

The effect of successive applications of urban compost (up te 150 and 400 t ha-1 during eight years) en the status ef phosphorus in a calcareous soíl (20%) was testad in a greenhouse experimento An 6-15-15 complex fertiliser was also applied for comparison. Five years of ryegrass and three of horticultural plants (tomate and eggplant) were successively cropped during the experimento Increases o...

Animal manures are suspected to be a major source of nitrate leaching due their low nitrogen use efficiency (NUE) by crops. However, actual measurements from animal manure under field conditions scarce. In an on-farm trial in Switzerland over 2.5 years, we used 15 N labelling trace the fate cattle slurry soil-plant system and test whether more was leached than mineral fertiliser. The experiment...

A nineteen year trial at Lake Tekapo compared the longer term trends of over-drilling legume and grasses into either previous undeveloped tussock country or following a previous legume phase. Tall oat grass (from summer sowing) and cocksfoot (from spring sowing) were the most successful of the sown grasses. They remained a low proportion of the swards but greater with prior herbicide treatment,...