Adekiya Aruna Olasekan, Adebiyi Ojo Vincent, Ibaba Ayibanoa Lekoo, Aremu Charity, Ajibade Razaq Ola
Agriculture Programme, College of Agriculture, Engineering and Science, Bowen University, Iwo, Osun State, Nigeria.
College of Agricultural Sciences, Landmark University, PMB 1001, Omu-Aran, Kwara State, Nigeria.
Heliyon. 2022 Nov 21;8(11):e11728. doi: 10.1016/j.heliyon.2022.e11728. eCollection 2022 Nov.
Studies on integrating biochar with potassium (K) fertilizer is not common. Hence, experiments were conducted in 2020 and 2021 to evaluate the sole and combined applications of biochar and K fertilizer on soil properties and performance of sweet potato. It was hypothesized that the effects of combined applications of biochar and K fertilizer on the growth, and yield of sweet potato will be more than their individual applications. The study each year consisted of a 3 × 3 factorial experiment with three levels (0, 10, and 20 t ha) of wood biochar and three levels (0, 70, and 120 kg ha) of K fertilizer (potassium chloride). The 9 treatment combinations have three replications and follow a randomized complete block design. Results revealed that biochar alone or in combination with K fertilizer improved soil physical and chemical properties, growth, and yield of sweet potato relative to the control and K fertilizer alone. The interaction of biochar and K (biochar × K fertilizer) fertilizer was significant for growth and yield parameters. The addition of K fertilizer to biochar improved the performance of sweet potato compared with sole applications of K fertilizer or biochar. 20 t ha biochar +70 kg ha K fertilizer and 20 t ha biochar +120 kg ha K fertilizer increased growth and yield relative to 10 t ha biochar +70 kg ha K fertilizer and 10 t ha biochar +120 ha kg K fertilizer. Since 20 t ha biochar +120 kg ha K fertilizer and 20 t ha biochar +70 kg ha K fertilizer were statistically similar, for this experiment, 20 t ha biochar +70 kg ha K fertilizer would be recommended for sweet potato production. Therefore, the addition of 70 kg K fertilizer with biochar has reduced the cost of increasing the rate to 120 kg ha which would have been economical in view of the high price and lack of K fertilizer in Nigeria and other sub-Saharan African countries.
关于将生物炭与钾肥相结合的研究并不常见。因此，在2020年和2021年开展了试验，以评估生物炭和钾肥单独及联合施用对土壤性质和甘薯性能的影响。研究假设是，生物炭和钾肥联合施用对甘薯生长和产量的影响将大于各自单独施用的效果。每年的研究包括一个3×3析因试验，有三个水平（0、10和20吨/公顷）的木质生物炭以及三个水平（0、70和120千克/公顷）的钾肥（氯化钾）。这9种处理组合有三个重复，并采用随机完全区组设计。结果表明，相对于对照和单独施用钾肥，单独施用生物炭或生物炭与钾肥联合施用均改善了土壤理化性质、甘薯的生长和产量。生物炭与钾肥（生物炭×钾肥）的交互作用对生长和产量参数具有显著影响。与单独施用钾肥或生物炭相比，在生物炭中添加钾肥提高了甘薯的性能。相对于10吨/公顷生物炭+70千克/公顷钾肥和10吨/公顷生物炭+120千克/公顷钾肥，20吨/公顷生物炭+70千克/公顷钾肥和20吨/公顷生物炭+120千克/公顷钾肥提高了生长和产量。由于20吨/公顷生物炭+120千克/公顷钾肥和20吨/公顷生物炭+70千克/公顷钾肥在统计上相似，因此对于本试验，推荐20吨/公顷生物炭+70千克/公顷钾肥用于甘薯生产。因此，鉴于尼日利亚和其他撒哈拉以南非洲国家钾肥价格高昂且供应短缺，添加70千克钾肥与生物炭相结合降低了将施用量提高到120千克/公顷的成本，这在经济上是可行的。
