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在巴基斯坦旁遮普的波特瓦地区(33°N,74°E),集约化土壤耕作,土壤侵蚀和低量作物残体的投入是导致土壤结构退化的原因。结构不稳定的土壤很容易受到侵蚀,反过来,土壤侵蚀又会造成作物产量的下降。因此,为了改善土壤的物理性状,在巴基斯坦旁遮普的干旱地区进行了田间试验。试验地点位于大学(拉瓦尔品第PMAS干旱农业大学)研究农场的园区内。2种不同等级(实验室级和商品级)的腐植酸(HA)各分8个水平,施用2年,处理分别为HL_0(对照,不施腐植酸),HL_1 10 kg HA/hm~2,HL_2 20 kg HA/hm~2,HL_3 30 kg HA/hm~2,HL_4 60 kg HA/hm~2,HL_5 90 kg HA/hm~2,HL_6 120 kg HA/hm~2和HL_7 150 kg HA/hm~2,各处理同时配合施用N-P-K(120-90-60 kg/hm~2)。试验期间,检测土壤总有机碳、饱和导水率、团聚体稳定性、容重、土壤含水量和作物产量。试验结果表明,腐植酸能通过影响土壤总有机碳、饱和导水率、团聚体稳定性、容重和土壤含水量等指标来改善土壤的物理性状。2年试验结果均表现为,实验室级的腐植酸比商品级的腐植酸能更好地改善土壤物理性状,从而提高小麦产量。2种不同级别的腐植酸各施用水平与对照相比,差异均显著。在120 kg/hm~2和150 kg/hm~2的腐植酸施用水平下,大多数指标均显示出了相似的结果,因此,从经济角度考虑,120 k g/hm~2的腐植酸用量为最佳施用量。
In the Poitwa region of Punjab, Pakistan (33 ° N, 74 ° E), intensive soil cultivation, soil erosion and low levels of crop residues contribute to the degradation of soil structure. Soil with structural instability is vulnerable to erosion, which in turn leads to a decline in crop yields. Therefore, in order to improve the physical properties of soil, a field experiment was conducted in arid areas of Punjab, Pakistan. The test site is located in the campus of the research farm at the University (Rawalpindi PMAS Arid Agricultural University). The humic acids (HA) of two different grades (laboratory grade and commercial grade) were divided into 8 levels for 2 years and were respectively treated with HL_0 (control, no humic acid), HL_1 10 kg HA / hm ~ 2, HL 2 20 kg HA / hm 2, HL 3 30 kg HA / hm 2, HL 4 60 kg HA / hm 2, HL 5 90 kg HA / hm 2, HL 6 120 kg HA / hm 2 and HL 7 150 kg HA / hm ~ 2, NPK (120-90-60 kg / hm ~ 2) was also applied with each treatment. During the experiment, soil total organic carbon, saturated hydraulic conductivity, aggregate stability, bulk density, soil water content and crop yield were measured. The results showed that humic acid can improve the physical properties of soils by influencing the total organic carbon, saturated hydraulic conductivity, aggregate stability, bulk density and soil water content. The results of 2 years showed that lab-grade humic acid can improve soil physical properties better than commercial-grade humic acid and improve wheat yield. The two levels of humic acid application levels compared with the control, the difference was significant. Under the humic acid application levels of 120 kg / hm ~ 2 and 150 kg / hm ~ 2, most of the indicators showed similar results. Therefore, from an economic point of view, the amount of humic acid at 120 kg / hm ~ The best application.