Variability of maize productivity on Kambisols in Mamuju Regency West Sulawesi, Indonesia

The research was done in Kalukku Distrct, Mamuju Regency on area 3 ha in 2020. This research was conducted through desk study and field research. The soil type at the study site belongs to the association of Kambisols. The innovation of technology integrated crop management and land resources, including the use of superior seed quality, namely Nasa 29, JH 37, and JH 45, planting system with a double row with a spacing of (100 - 40 cm) x 20 cm (1 plant/hole), balanced use of fertilizer with rate 250 kg Urea and 300 kg NPK Phonska/ha. Based on the land suitability map of ICALRD, land suitability for maize classified to marginal suitability (S3) by a limiting factor are nutrient retention (nr), nutrient availability (na), water availability (wa), and rooting media (rc). The land area of marginal suitability (S3) for maize of 46,778 ha, consisting of S3-nr/na/wa of 5,582 ha, S3-rc/wa of 3,463 ha, and S3-wa of 37,733 ha. Filed research shows that the average of maize productivity with application of technological innovation, such us superior seed quality, plant spacing with double row planting system, and balanced fertilization, can reach 9.43 t/ha, higher than the average yield of maize in West Sulawesi and Mamuju Regency. To increase maize productivity in West Sulawesi, it is recommended to overcome limiting factors and application technology integrated crop management of maize, especially the use of superior seed quality, plant spacing with double row planting system, and balanced use of fertilizer.