Biochar and Polyhalite Fertilizers Improve Soil’s Biochemical Characteristics and Sunflower (Helianthus annuus L.) Yield

Biochar (BC) applications have multiple impacts on crops’ nutrient availability, growth and yield depending the feedstock type pyrolysis conditions. Pot field experiments were conducted to examine effects of biochars (BCs) prepared from three different feedstocks, Acacia modesta wood biochar (AWB), Dalbergia sissoo (DWB) poultry litter (PLB), soil’s uptake by wheat (Triticum aestivum) sunflower (Helianthus annuus) crops their attributes. All BCs applied at rate 10t ha−1 in each treatment both experiments, pot trials designed according a two-factor factorial completely randomized design (CRD) complete block (RCBD), respectively. The concentration soil NO3-N, NH4-N, Olsen P extractable K increased 98.5, 296, 228 47%, respectively, experiment with application PLB+polyhalite (PH) treatments. Similarly, NH4-N contents 91, 268 156% under PLB+PH treatment, However, microbial biomass phosphorus (MBP) was significantly higher after AWB+PH increments 127 109% while nitrogen (MBN) 16 14% than control DWB+PH treatments, experiment. combined total organic carbon (TOC) 193%. Moreover, co-applications PH grain yields up 58% harvest index 45%. Overall, no negative impact respect observed content plant growth. Hence, for immediate crop benefits health, using (PLB) alone or combination chemical fertilizers is recommended.