A nitrogen nutrition index (NNI) is presented as a robust interpretation method to guide profitable and sustainable N applications in dry climates with infertile soils.
At present (mid-spring) we have faced some challenging conditions, in particular long periods of wet conditions, waterlogging, limited opportunities for nutrient application – but where waterlogging has not been severe – high crop yield potentials. There are still things that can affect the final o
Grain producers have become more proficient at managing N in response to seasonal conditions, matching the right source with the right rate and applying the N at the right time and in the right place. In general P management is taken care of with at-sowing SSP, MAP, DAP or TSP, and after sowing the
When the uptake of any of the essential nutrients is inadequate, the plant metabolism becomes disrupted and distinctive symptoms often begin to appear. Since nutrients are involved in specific growth processes, deficiency symptoms provide clues to what nutrient might be lacking. However, most nutr
Summary Monitoring nutrient performance through a range of metrics or indicators is essential to assess changes over time. These metrics need to be described in terms of the system boundary, the time scale used and the sources of the raw data used. For broad scale nutrient use efficiency and effec
Research in Central Queensland has shown long term responses to deep placed P and K in cropping system. In 2014 a site was selected at Chelmsford (40 km north of Kingaroy, Queensland) to assess the response to deep placed P and K on these soils. The soil type is a vertosol and Table 1 below shows
In order to provide additional K response data to the Better Fertilizer Decisions for Crops database, a field experiment was established at Breadlebane in the Southern Highlands of New South Wales. A similar experiment was located in the same paddock in 2014. This region is located between Canberr
Two field experiments were established in central Queensland at Capella and Gindie to investigate the immediate and then residual benefit of deep placed (20 cm) nutrients in this opportunity cropping system. The field sites had factorial combinations of P (40 kg P/ha), K (200 kg K/ha) and S (40 kg
A new experiment was initiated at Chelmsford (near Kingroy) in 2014. This experiment again banded P and K compared to an unfertilized control, and compared 4 rates of K (O, 25, 50 and 100) where 40 kg P/ha applied. It also compared the response of 100 kg K/ha where P was present or absent. There
The idea that there is a "ideal" soil is somewhat romantic, as a good soil is one that is fit for purpose - which in the case of agriculture is the capacity to sustainably grow plants. To do so the soil should supply the right nutrients, provide storage for water and be aerated so roots and soil mi
Research is world class and funding models most commonly include public and private partnerships, with industry support through compulsory levies on production providing growers with leverage over the strategic and tactical issues addressed.
Dr. Robert Norton
Regional Director Australia and New Zealand