This study aims to investigate the effects of polyacrylamide (PAM) alone or integrated with other soil amendments on soil fertility and Teff (Eragrostis tef (Zucc.) Trotter) yield. A field experiment was carried out for 2 years in three contrasting agroecological zones of the Upper Blue Nile basin, Ethiopia, using a randomized complete block design with 3 replicates. The amendments applied were PAM (40 kg ha⁻¹), biochar (B, 8 t ha⁻¹), lime (L, 4 t ha⁻¹), gypsum (G, 5 t ha⁻¹), farmyard manure (FYM, 5 t ha⁻¹), PAM + B, PAM + L, and PAM + G, and control. The results showed that PAM + L, PAM + B, and L treatments noticeably improved pH, available phosphorus (P_av), total nitrogen (TN), organic carbon, and water infiltration in the Aba Gerima and Guder soils, whereas the PAM + B, B, and FYM treatments expressively increased soil water content, P_av, and TN in the Dibatie soil. Likewise, compared with the control, teff yield significantly (p < 0.05) increased by about 25 to 37% at Guder, 25 to 32% at Aba Gerima, and 20 to 31% at Dibatie. The partial-budget analysis showed that PAM + L at both Guder and Aba Gerima, and PAM + B at Dibatie were more profitable, with net benefits of 1056, 1663, and 1975 USD ha⁻¹, respectively. Applying PAM in combination with lime on moderately to strongly acidic soils, and with biochar on slightly acidic soils could have a synergistic effect, leading to improved soil properties and crop yield.

这项研究旨在调查聚丙烯酰胺（PAM）单独使用或与其他土壤改良剂结合使用对土壤肥力和Teff（草rag（Succ。）Trotter）产量的影响。在埃塞俄比亚上蓝尼罗河盆地三个对比鲜明的农业生态区中进行了为期2年的田间试验，采用了随机的完整块设计，重复了3次。适用的修正案包括PAM（40 kg ha ^-1），生物炭（B，8 t ha ^-1），石灰（L，4 t ha ^-1），石膏（G，5 t ha ^-1），农家肥（FYM ，5 t ha ^-1），PAM + B，PAM + L和PAM + G以及对照。结果表明，PAM + L，PAM + B和L处理显着提高了pH，有效磷（P _av），Aba Gerima和Guder土壤中的总氮（TN），有机碳和水的渗透，而PAM + B，B和FYM处理显着增加了Dibatie土壤中的土壤水分，P _av和TN。同样，与对照相比，teff产量 在Guder处显着提高（p <0.05），在Aba Gerima处提高25％至37％，在Dibatie处提高20％至31％。局部预算分析显示，Guder和Aba Gerima的PAM + L以及Dibatie的PAM + B利润更高，净收益分别为1056、1663和1975美元ha ^-1， 分别。在中等酸性至强酸性土壤上施用PAM与石灰结合，在弱酸性土壤上施用生物炭可产生协同效应，从而改善土壤性质和作物产量。