Defining mineral nutrient requirements for yield and quality (January 2002)
Batten, G Marr,K
This IREC Farmers Newsletter article presents and update on a RIRDC project investigating relating minerals in rot shoots and grain to soil tests, yield and grain quality. Australian rice farmers achieve high yields by world standards. But are these yields sustainable? High yields mean high removal of nutrients from farm. Burning stubble increases nutrient loss. Irrigation water is a source of unwanted sodium but also a useful source of sulphur calcium and magnesium. In conclusion this study indicates that the rice cropping will only be sustainable in the short term with adequate inputs of N, P and Zn supplied. The rate of export of Potassium and some trace elements needs to be assessed in relation to the reserve of the plant available amount of these elements in soils used to grow rice.