Effect of adding chemical, organic fertilizers and spraying seaweed extracts on the availability of NPK and organic material in calcareous soil

A field experiment was carried out in the agricultural season 2021-2022 one of farming fields region Muqdadiya, Al-Harouniya district, located 40 km northeast Baquba district Diyala governorate. (Soil Survey Staff, 2006). It is at a longitude 53° 34' N and latitude 56° 04° 45° S. The aimed to study effect adding chemical organic fertilizers spraying seaweed extracts on NPKS concentrations cauliflower yield. investigation included three factors; first factor addition fertilizer (buffalo waste) levels (0, 5 10%) terrace size, which M1, M2 M3 respectively symbolize. added depth 0-30 cm month before planting seedlings field. second NPK compound (20:20:20) two (0 full recommendation 300 kg H-1 when planted as feed) symbolized by C1 C2, respectively. third extract with 2 4) ml L-1 represented A1, A2 A3. results showed that significantly affected availability material soil. 2C treatment (and H-1) outperformed reached 2.96 gm kg-1; nitrogen soil amounted %. As well phosphorous soil, 76.28 mg P 1-soil, potassium buffalo manure calcareous soils readiness material. Also, treatments value 3.34 23. 4 g/kg-1, 29.88 31.25 kg-1-. also excelled soils, 86.98 kg-1-soil M kg-1-soil. 361.33 triple interaction between studied factors soils. M2×C2×A3 recording highest value, 3.85 kg-1, 37.75 %, 94.16 kg-1 436.42 kg1-soil. Keywords: fertilization, extracts.