National Outstanding Agriculture Research Talents and Innovation Team, Inner Mongolia Agricultural University, Hohhot, 010019, Inner Mongolia, China.
Central Experimental Farm, Agriculture and Agri-Food Canada, Ottawa Research and Development Centre, Ottawa, ON, K1A 0C6, Canada.
Sci Rep. 2020 Oct 26;10(1):18282. doi: 10.1038/s41598-020-75350-9.
A field experiment was conducted in a semi-arid region in northern China to evaluate the effects of bentonite soil amendment on field water-holding capacity, plant available water, and crop photosynthesis and grain quality parameters for millet [Setaria italic (L.) Beauv.] production over a 5-year period. Treatments included six rates of bentonite amendments (0, 6, 12, 18, 24 and 30 Mg ha) applied only once in 2011. The application of bentonite significantly (P < 0.05) increased field water-holding capacity and plant available water in the 0-40 cm layer. Bentonite also significantly (P < 0.05) increased the emergence rate, above-ground dry matter accumulation (AGDM), net photosynthesis rate (Pr), transpiration rate (Tr), soil and plant analysis development (SPAD) and leaf water use efficiency (WUE). It also increased grain quality parameters including grain protein, fat and fiber content. Averaged over all the years, the optimum rate of bentonite was 24 Mg ha for all plant growth and photosynthesis parameters except for grain quality where 18 Mg ha bentonite had the greatest effect. This study suggests that bentonite application in semi-arid regions would have beneficial effects on crop growth and soil water-holding properties.
在中国北方半干旱地区进行了一项田间试验，以评估膨润土土壤改良剂对谷子[Setaria italic（L.）Beauv.]生产的田间持水量、植物有效水以及作物光合作用和籽粒品质参数的影响，为期 5 年。处理包括仅在 2011 年施用 6 种膨润土改良剂（0、6、12、18、24 和 30 Mg ha）。膨润土的施用显著（P < 0.05）增加了 0-40 cm 土层的田间持水量和植物有效水。膨润土还显著（P < 0.05）增加了出苗率、地上干物质积累（AGDM）、净光合速率（Pr）、蒸腾速率（Tr）、土壤和植物分析开发（SPAD）和叶片水分利用效率（WUE）。它还增加了籽粒品质参数，包括籽粒蛋白质、脂肪和纤维含量。平均所有年份，膨润土的最佳施用量为 24 Mg ha，除了膨润土 18 Mg ha 对籽粒品质的影响最大外，所有植物生长和光合作用参数均如此。本研究表明，在半干旱地区施用膨润土将对作物生长和土壤持水性能产生有益影响。
