混合方式对泡沫砂与土壤混合均匀性的影响

通过设置常规混合+风干态泡沫砂(CK)、常规混合+水浸态泡沫砂(1T)、常规混合+泥浆态泡沫砂(2T)、分层混合+风干态泡沫砂(3T)和分层混合+水浸态泡沫砂(4T) 5个处理,研究了不同混合方式对泡沫砂和土壤混合均匀性的影响,并采用容重的标准差和变异系数表征混合均匀性。结果表明:泡沫砂形态显著影响了混合均匀性。采用常规混合时,水浸态泡沫砂显著增加了0～10 cm和0～20cm土层混合均匀性,容重的标准差比风干态泡沫砂分别降低了188%和105%,容重的变异系数分别降低了62.1%和50.1%;与风干态泡沫砂相比,泥浆态泡沫砂不仅显著降低了不同土层的混合均匀性,还显著降低了混合物内部的混合均匀性,0～10 cm土层容重的标准差和变异系数分别比10～20 cm土层显著增加68.1%和50.8%。单变量分析表明,混合方式对混合均匀性无显著性影响,混合方式和泡沫砂形态之间无交互效应,泡沫砂形态是影响泡沫砂和土壤混合均匀性的主要因素。采用水浸态泡沫砂在常规混合方式下与土壤混合,不仅提高了混合物整体以及不同土层的混合均匀性,而且还降低了不同层次之间混合均匀性的差异。因此,建议采用常规混合+水浸态泡沫砂的方式混合土壤和泡沫砂。

Effect of Mixing Methods on Mixing Uniformity of Porous Clay Ceramic and Soil

In greenhouse cultivation, the large difference in properties of material composition of the matrix may cause uneven mixing and affect the performance of the matrix. Porous clay ceramic (PLC) is a lightweight, porous inorganic soil conditioner that significantly increases soil aeration. However, the improvement effect of PLC may be affected by uneven mixing of PLC and soil due to the large difference in bulk density of PLC and soil. In this study, PLC is taken as an example to investigate the effects of different mixing methods on the mixing uniformity of PLC and soil, namely conventional mixing method + air-dried PLC (CK), conventional mixing method + water-immersed PLC (1T), conventional mixing method + Mud-state PLC (2T), layered mixing method + air-dried PLC (3T) and layered mixing method + water-immersed PLC (4T). The mixing uniformity is characterized by the standard deviation and coefficient of variation of the bulk density. The results show that the forms of PLC significantly affects the mixing uniformity. When conventional mixing is used, the water-immersed PLC significantly increased the mixing uniformity of the 0-10cm and 0-20cm soil layers, and the standard deviation of the bulk density was reduced by 188% and 105%, respectively, compared with the air-dried PLC; the coefficient of variation of the bulk density is reduced, 62.1% and 50.1%, respectively. Water-impregnated PLC enhances the uniformity of PLC and soil mixing. The muddy PLC not only significantly reduced the uniformity of different soil layers mixed with PLC and soil, but also significantly increased the difference in mixing uniformity between 0-10cm and 10-20cm soil layers. The standard deviation and variation of coefficients of bulk density in 0-10cm soil layers was 68.1% and 50.8%, respectively, higher than 10-20 cm. Univariate analysis showed that the mixing method had no significant effect on the mixing uniformity, and there was no interaction between the mixing method and the forms of PLC. However, the forms of PLC was the main factor affecting the mixing uniformity of PLC and soil. The use of water-immersed PLC mixed with the soil in a conventional mixing method not only improved the mixing uniformity of the whole mixture and different soil layers, but also reduced the difference in mixing uniformity between different layers. Therefore, conventional mixing method + water is suggested for mixing soil and PLC.