Abstract
Low soil phosphorus (P) availability is an important impediment to successful shallot cultivation in ultisols, a type of soil distinguished by its low fertility. A field experiment was conducted to investigate the effects of rice husk biochar in combination with various types of phosphate fertilizers on ultisol P status, growth performance and production of shallot. The experiment followed a completely randomized design with three replications and involved the two fixed factors: the application of three different levels of rice husk biochar (0, 5, and 10 t ha-1) and addition of three distinct phosphate fertilizer sources (90 kg ha-1) that included triple superphosphate (TRP), rock phosphate (RP) and guano. Our experiment revealed that using rice husk biochar in conjunction with various sources of P fertilizer had a propensity to raise the pH, enhance the availability and total P content in the observed soil. Furthermore, the application of 5 t ha-1 of rice husk biochar, along with the use of TSP resulted in the highest P availability in the soil. The use of biochar and P fertilizers has the potential to be an effective strategy for improving soil phosphorus status and increasing shallot production, as evidenced by the weight of storable bulbs.
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