Reviewing the results of soil tests identifies opportunities to improve nutrient management in the Wet Tropics

Collecting soil samples according to industry best practice guidelines, using a reputable laboratory to analyse samples, and interpreting soil-test results using the SIX EASY STEPS® nutrient-management guidelines allows soil-ameliorant and crop-nutritional requirements to be determined. Identifying soil-chemical constraints, effectively managing these constraints, and achieving balanced crop nutrition is important for productive, profitable and sustainable sugarcane production. Records of available soil-test results for the Tully, South Johnstone and Mulgrave sugarcane production districts were collated and reviewed. It is evident that soil acidity and nutrient deficiency, specifically calcium and magnesium, are impacting the productivity of older ratoon crops and are likely to be affecting the performance of legume cover-crops grown during the traditional fallow period. Opportunities to alleviate soil-chemical constraints, overcome nutrient deficiencies and refine on-farm nutrient management are discussed.