The DRIS methodology to determine the best balance of Nitrogen, phosphorus and potassium levels on the yield of Chickpea plant (Cicer arietinum L.)

This experiment was conducted during the spring growing season of 2020 conducted in the field at the Grdarasha farm field of Agricultural Engineering College, Salahaddin University in Erbil, located in the south of Erbil city, Latitude: 36.11284 N, Longitude: 44.01247 E. The soil texture class was silty clay loam, the type of soil vertisols, to study the effect of four levels of phosphorus TSP (0, 20, 40, 60) Kg P. ha-1,Three levels of K (0, 15, 30) Kg K. ha-1, and Three levels of N (0, 15, 30) Kg N. ha-1. There combination of yield components and nutrient balance of chickpea plants by using DRIS methodology, by using; split split block design with three factors (N, P, and K) 36 treatment with 3 replicates was used. The main results could be summarized as The combination between Nain plot potassium, Sub main plot nitrogen, and Sub sub main plot phosphorus levels affected the yield of the chickpea plant significant also the maximum yield was recorded in treatment combination (K2N1P2) was (1.55Mg ha-1). Whereas the lowest mean value (0.73Mg ha-1) was recorded from the treatment combination (K0N0P0). The combined effect of nitrogen, phosphorus and potassium fertilizer on nutrient balance indices (NBI) and yield in chickpea plants. The lowest nutrient balance index was recorded from the treatment combination (K2N1P2).