Nutrient management and balanced fertilization in Xinjiang
IPNI-2006-CHN-XJ2
03 Feb 2012
2011 Annual Interpretive Summary
Nutrient Management of Cotton and Processing Tomato with Drip Irrigation in Xinjiang Province, 2011
In the drip-irrigated cotton grown in Changji City, the recommended NPK rate of 240-150-75 kg N-P2O5-K2O/ha and its corresponding omission plots found N to be most limiting followed by P and then K. Agronomic efficiencies (AE) at the recommendation fertilizer rate were 7 kg seed cotton increase/kg N, 7 kg seed cotton increase/kg P2O5, and 54 kg seed cotton increase/kg K2O, while recovery efficiencies (RE) were 56, 25, and 58%, respectively. Basal application of 65% of the recommended P rate before planting and the remaining 35% applied through drip irrigation produced 6% more yield than 100% basal application, and also improved P use efficiency. Fertigation with reduced P rate (2/3 recommended P) produced 5% more yield than 100% recommended P as basal application.
In drip-irrigated processing tomatoes grown in Changji City, the recommended NPK rate of 360-210-120 kg N-P2O5-K2O/ha increased tomato yields by 567, 16, and 5% when compared with yields in -N, -P and -K plots, respectively. Agronomic efficiencies at the recommended fertilizer rate 77 kg tomato/kg N, 49 kg tomato/kg P2O5, and 32 kg tomato/kg K2O, while RE were 48, 25, and 54%, respectively. Application of P with fertigation produced similar tomato yields as with 100% basal application. XINJIANG-NMBF