Liquid fertilizers (LFs) produced by microwave-assisted acid hydrolysis of livestock and poultry wastes were applied to potted hot pepper ( Capsicum annuum L.) to evaluate their potential to be used as amino acid LFs. A preliminary experiment was conducted to determine the optimum acid-hydrolysis conditions for producing LFs from a mixture of pig hair and faeces (P) and another mixture of chicken feathers and faeces (C). Two LFs were produced under the optimum acid-hydrolysis conditions (acidification by sulphuric acid (7.5 mol L−1) in a microwave (200 W) for 90 minutes), and a commercial amino acid LF (Guo Guang (GG)) was used for comparison. P, C and GG fertilizers were tested in potted hot pepper cultivation at two doses, whereas no fertilizer application served as the control (CK). P and C fertilizers significantly increased the fruit yield compared with GG fertilizer, particularly at the higher dose. Moreover, the treatments improved the fruit vitamin C and soluble sugar contents in the order of C > P > GG compared with CK. These results could be attributed to more types of amino acids in C fertilizer than in P and GG fertilizers. The results also indicated that the prepared fertilizers could significantly increase the shoot and root dry weight, soil available nitrogen and phosphorus contents and nitrogen, phosphorus, and potassium (NPK) uptake by plants compared with CK. In conclusion, microwave-assisted acid hydrolysis could effectively convert unusable wastes into valuable fertilizers comparable or even superior to commercial fertilizers.

中文翻译：

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微波辅助酸解畜禽粪便生产液体肥料及其对辣椒种植的影响

将畜禽粪便微波辅助酸水解生产的液体肥料（LF）应用于盆栽辣椒（Capsicum annuum L.），以评估其作为氨基酸LF的潜力。进行了初步实验以确定从猪毛和粪便的混合物（P）以及另一种鸡羽毛和粪便的混合物（C）生产LF的最佳酸水解条件。在最佳酸解条件下（硫酸酸化（7.5 mol·L−1）在微波炉（200 W）中加热90分钟），并使用市售氨基酸LF（国光（GG））进行比较。在盆栽辣椒种植中测试了两种剂量的 P、C 和 GG 肥料，而不施肥作为对照（CK）。与GG肥料相比，P和C肥料显着提高了果实产量，特别是在较高剂量时。与CK相比，各处理提高果实维生素C和可溶性糖含量的顺序为C>P>GG。这些结果可能归因于碳肥中的氨基酸种类比磷肥和GG 肥中的氨基酸种类更多。结果还表明，与对照相比，制备的肥料可显着提高地上部和根部干重、土壤速效氮和磷含量以及植物对氮、磷、钾（NPK）的吸收。总之，微波辅助酸水解可以有效地将无法利用的废物转化为与商业肥料相当甚至优于商业肥料的有价值的肥料。