Effects of Protein Hydrolysate on Soil Fertility and Heavy-Metal Accumulation in Sinapis alba L.

The aim of this study was to evaluate the usefulness of protein hydrolysate (Hemozym) for fertilization purposes used in unpolluted and cadmium-polluted soil. Three levels of Hemozym (0, 0.1, and 0.2 cm³ kg^?1 dry weight [DW] soil) and cadmium (Cd) rate 5 mg kg^?1 DW soil were used. The fertilizer value of Hemozym was evaluated based on characteristics of the sorptive complex and soil respiratory activity as well as based on the soil and plant heavy-metal content. Increased soil fertility due to the beneficial effect of Hemozym on the improvement in the physicochemical properties of the soil and its microbial activity. However, they do not allow us to determine unambiguously the effect of this fertilizer on solubility vs. binding of heavy metals that occur naturally in the soil (zinc [Zn], copper [Cu], and lead [Pb]) and of intentionally introduced Cd, in spite of an indicative tendency towards the conversion of metals into poorly soluble forms.     

蚯蚓对土壤中重金属的富集作用研究

通过向供试土壤中添加CuSO4、ZnSO4、Pb（Ac）2、HgCl2以模拟受污土壤,研究接种于其中的微小双胸蚯蚓对重金属的富集作用。以不加重金属盐类为对照,分别研究了不同培养时间和不同重金属浓度对富集量的影响。结果表明,蚯蚓对各种重金属的富集量随着培养时间的增加而变化,且对不同重金属最大富集量的出现时间也不相同。在第2周时蚯蚓对Cu、Pb富集量达到最大,而对Zn的富集量在第4周时达到最大。与Cu、Zn、Pb的富集量相比,蚯蚓对Hg没有明显的富集作用,且对Hg的最大富集量时间不明显。在其耐受浓度范围内,蚯蚓对重金属的富集量随着重金属浓度的增加而增加,且蚯蚓对重金属的吸收顺序为：Zn〉Cu〉Pb〉Hg,说明了微小双胸蚯蚓对Cu、Zn、Pb、Hg4种元素有一定的忍耐和富集能力,但其对重金属的忍耐和富集能力是有选择性的,说明不同重金属表现出的毒性是不一样的。研究结果初步推断,影响蚯蚓对重金属富集作用的主要原因可能是体内酶的作用,不同重金属可以从多方面干扰了动物机体内的生理生化功能。     

Effect of Organic Acids on Heavy-Metal Uptake and Growth of Canola Grown in Contaminated Soil

Heavy-metal pollution of soils causes many environmental, animal, and human health problems. Phytoextraction of heavy metals from contaminated soils is an effective and economic technique. Humic acids are naturally occurring phenol body polymerisates, which form chelate compounds with heavy metals. In the present study the influence of soil- applied humic, citric, and malic acids on the lead (Pb), cadmium (Cd), and chromium (Cr) uptake from a contaminated soil by canola plant was examined in a greenhouse experiment. The experiment was arranged in factorial design based on randomized complete blocks with three replications. The factors of experiment included three organic acids (humic, citric, and malic acid) as first factor and five concentrations [0, 0.001, 0.002, 0.003, and 0.004 (v/v)] as second factor. The results showed that increase in organic acid concentration significantly increased heavy-metal uptake by canola plant, which accumulated heavy metals in different parts of the plant. In addition, crop growth representing by plant height and plant dry weight as well as seed production significantly decreased. Based on these results, canola can be considered as effective crop for phytoextraction of heavy metals from contaminated soils.     

Heavy-Metal Uptake and Growth of Bouteloua Species in Semi-arid Soils Amended with Biosolids

An experiment was conducted in three wild grass species of Bouteloua genus to compare the effect of application of biosolids on the accumulation of heavy metals, biomass production, and nutrient uptake. Biosolids were applied at rates of 0, 3.5, 7, and 10.5 Mg ha^?1 to two different soil types collected from the southern Chihuahuan Desert. The shoot biomass of B. gracilis (BOGR) and B. scorpioides (BOSC) was two to three times greater than the control while in B. curtipendula (BOCU) in was 75% in both soils. In BOGR, nitrogen and phosphorus uptake were 4–4.5 times greater than the control in calcareous soil. With few exceptions, there was no significant difference of heavy-metal concentrations (copper, chromium, arsenic, nickel, and zinc) in the plant tissues compared to the control. The application of biosolids showed interspecies variability in growth response and nutrient uptake with a minimal risk of heavy-metal uptake for Bouteloua wild species.     

Application of Organic Wastes in a Soil Polluted with Different Rates of Cr-Pb: Effects on Soil Biological Properties

An experiment was performed to determine the effects of adding municipal solid waste (MSW) and poultry manure (PM) to a soil polluted with chromium (Cr), lead (Pb), and Cr + Pb on the biological parameters of the soil. Soil was mixed with two solutions of Cr(NO₃)₃ and/or Pb(NO₃)₂ to give three concentrations (0, 100, and 250 mg Cr kg^?1 soil and 0, 100, and 250 mg Pb kg^?1 soil) and treated with MSW or PM. When the soil was contaminated with the metals without combining, the greatest adenosine triphosphate (ATP), urease, and phosphatase inhibition percentages occurred for 250 mg Pb kg^?1 soil. When the heavy metals were mixed, the inhibition of the biochemical parameters increased. The application of MSW and PM decreased the inhibition of the biochemical parameters and microbial population in the polluted soils. The inhibition percentage was greater for the soil amended with MSW than with PM, possibly due to the high humic acid concentration.     

Effects of inoculation with stress-adapted arbuscular mycorrhizal fungus Glomus deserticola on growth of Solanum melogena L. and Sorghum sudanese Staph. seedlings under salinity and heavy metal stress conditions

The beneficial effects of a Glomus deserticola strain isolated from the rhizosphere of grasses (belonging to Poaceae family) growing along the industrial waste from a distillery were investigated under stress conditions. The study was conducted to assess the efficacy of the arbuscular mycorrhizal (AM) fungal ecotype in salinity and heavy metal (HM) tolerance of eggplant (Solanum melongena L.) in soils amended with various stress levels of NaCl, zinc and cadmium. Mycorrhizal (M) seedlings produced a significantly (p < 0.05) greater growth response and were more tolerant to salt and HM stresses than nonmycorrhizal (NM) seedlings in all treatments. The HM contents in the plant tissues were significantly higher in M than NM eggplants. Furthermore, when the efficacy was compared with other AM isolates in HM-polluted soils with Sudan grass (Sorghum sudanese Staph.) as a test plant, the AM ecotype responded best to these soils, as evident from the significantly greater growth response and its aggressiveness in colonizing roots in all soil types tested. These results suggest that this G. deserticola ecotype can be used as an effective tool to alleviate the adverse effects of excessive salinity and HM toxicity on plant growth. Finally, the isolate may have potential in the bioremediation of polluted soils.     

Effects of Wastewater Irrigation on Physicochemical Properties of Soil and Availability of Heavy Metals in Soil and Vegetables

The present study investigated the impact of irrigation with wastewater on nutritional property and heavy‐metal concentrations in the soil and consequent accumulation in vegetables at sites having long‐term uses of wastewater for irrigation. Samples of irrigation water, soil, and root and shoot parts of palak plants were analyzed to determine the concentration of heavy metals. Wastewater irrigation led to increases in the total and phytoavailable heavy‐metal concentrations in the soil at all the sites. Heavy‐metal concentrations in soil under wastewater irrigation were negatively and positively correlated with soil hydrogen potential (pH) and organic carbon (OC), respectively. The enrichment factor and metal pollution index were higher at wastewater‐irrigated sites as compared to the clean water–irrigated ones. The study concludes that wastewater irrigation modified the physicochemical properties of the soil, leading to more availability of heavy metals in the soil and consequently to the plant.     

醋糟、粉煤灰对盐渍地高粱生长及土壤性状影响的研究

以高粱生长情况和盐渍土改良作为切入点,研究醋糟、粉煤灰对盐渍地高粱生长及盐渍土的改良效果,为醋糟、粉煤灰盐渍土改良提供理论指导和技术依据。试验采用随机区组设计,分别设置纯醋糟(处理1)、醋糟与粉煤灰1∶1配比(处理2)、醋糟与粉煤灰2∶1配比(处理3)和对照4个处理。试验结果表明:高粱生长的4个时期,土壤速效养分含量均呈现先上升后下降的趋势,醋糟、粉煤灰处理效果好于对照,其中以醋糟和粉煤灰1∶1配比效果最好;对照处理土壤容重播种前后下降幅度最小,处理1、处理2、处理3土壤容重降幅分别为19.6%、28.6%、11.32%;处理1、处理2、处理3穗长分别比对照提高了6.25%、9.06%、3.93%;千粒重分别比对照提高了8.41%、9.26%、1.35%;单株产量分别比对照提高了10.53%、13.26%、8.89%;处理以醋糟、粉煤灰1∶1配比效果最好。综上所述,醋糟、粉煤灰改善了盐渍土理化性质,改善深层土壤的环境,为植物生长提供了适宜的生长环境,从而提高了高粱产量。     

土壤调理剂对冷浸田土壤特性及水稻生长的影响

冷浸田因长期受冷泉水浸渍,土体封闭,通气不良,土壤Eh值和有效养分低下,水稻产量偏低。本研究以单施化肥为对照,设置增施生物稻糠、脱硫灰、石膏、过氧化钙和硅钙肥处理,通过田间小区试验和定期观测,探究了不同土壤调理剂对冷浸田土壤特性及水稻生长的影响。结果表明:与CK处理比较,施用生物稻糠和石膏土壤活性还原物质含量分别降低了52%和30%,从而提高了土壤的氧化性能;土壤细菌数分别提高200%和96%,真菌数分别下降16%和10%,进而提高土壤供氮能力。而施用脱硫灰和石膏调节了土壤养分,土壤有效磷含量均增加83%,速效钾含量分别增加50%和13%,水稻叶绿素含量分别提高3%和5%。施用石膏、生物稻糠和脱硫灰水稻分别增产13.0%、10.1%和5.1%。研究认为,施用土壤调理剂能消减冷浸田还原物质毒害,提升土壤微生物活性,提高土壤养分供应,促进水稻增产,并以生物稻糠、石膏和脱硫灰效果最佳。     

生物质炭添加对重金属污染稻田土壤理化性状及微生物量的影响

分析了生物质炭添加对红壤性水稻土理化性状、重金属含量及微生物生物量的影响。通过田间小区长期定位试验,一次性施入不同量生物质炭(0,10,20,30,40t/hm2),于2017年9月采集各处理表层土样(0—15cm),研究土壤理化性状、重金属含量及微生物生物量的变化。结果表明:生物质炭添加对土壤理化性状、重金属含量及微生物生物量均有显著影响。与对照相比,供试土壤的pH、EC和有机质含量随生物质炭添加量的增加而增大,增幅分别为5.11%~18.43%,37.62%~104.31%和1.72%~22.41%,而有效磷和铵态氮含量随生物质炭添加量的增加呈先增大后减小趋势,分别在生物质炭添加量为10t/hm2和30t/hm2时达到最大值。随生物质炭添加量的增加,土壤有效态Cd和有效态Pb含量均呈降低趋势,而土壤有效态As含量呈先增加后减少的趋势,三者均在生物质炭添加量为40t/hm2时达到最小值。土壤微生物生物量碳、氮和微生物商随生物质炭添加量的增加均呈先升高后降低的趋势,均在生物质炭添加量为20t/hm2时达到最大值。相关分析表明,生物质炭添加量分别与土壤有效态Cd和Pb含量之间呈极显著负相关(P0.01);通径分析表明,生物质炭主要是通过直接作用影响土壤有效态Cd含量,而土壤pH、EC、有机质、微生物生物量碳、氮和有效磷主要是通过间接作用影响土壤有效态Cd含量。因此,添加适量生物质炭不仅可以改善土壤重金属污染现状和土壤理化性状,提高土壤养分含量,还可以改良土壤生物学性质,增加土壤微生物量。研究结果可为提高稻田土壤肥力和改善土壤重金属污染状况提供科学依据。     

Effects of Land Use on Selected Properties and Heavy Metal Concentration for Soil in the US Great Plains

There is increasing interest in the current conditions of dynamic soil properties and element concentration in the US Great Plains as well as the nature and magnitude of change due to land use and management practices. The study was conducted on Pawnee soil, a major U.S. benchmark soil in the Great Plains. The objectives were to investigate the effects of four common land uses [NoTill (NT), Conventional Till (CT), Grass (G), and Conservation Reserve Program (CRP)] on: i) selected soil properties [total organic carbon (TOC), bulk density (BD), pH, cation exchange capacity (CEC), and electric conductivity (EC)] and ii) water-soluble concentration of 14 heavy metals and micronutrients. The analysis of variance (ANOVA test) indicated that the land use had significant effects on the TOC, CEC, and EC, whereas no relation was detected for BD and pH. Irrespective of land use, the mean element concentration in soil could be arranged in the order: Si (Silicon) > Al (Aluminum) > Fe (Iron) > Mn (Manganese) > B (Boron) > Zn (Zinc) > Cr (Chromium) > Ni (Nickel) > Cu (Copper) > As (Arsenic) > Pb (Lead) > Co (Cobalt) > Mo (Molybdenum) > Cd (Cadmium). Silicon, Al, and Fe which are usually form the major components of soil minerals were present in much higher levels (91 to 308 mg/kg) than other elements in soil. Essential plant micronutrients such as B, Cu, Mn, Mo, and Zn, generally presented moderate levels in soil (7 to 698 µg/kg), whereas toxic heavy metals such as As, Cd, Co, Ni, and Pb were present in the lowest values (0.7–96.2 µg/kg). The ANOVA test indicated land use had significant effects on As, B, Cd, Co, Cu, Ni, and Si concentration in soil while effects were insignificant for other elements. The data proved the important effects of land use on dynamic soil properties as well as nutrient and heavy metal for a major benchmark soil. Thus, more studies on other major soils are warranted. The information is needed to modify and adapt management practices to improve and sustain soil health and water quality in the US Great Plains.     

施用生物炭对红壤性水稻土重金属钝化与土壤肥力的影响

通过田间小区试验,分析了不同用量的生物炭处理下(0,10,20,30,40 t/hm^2)0-17,17-29 cm土层土壤的理化性质、重金属钝化及酶活性的影响。采用IFI(土壤肥力综合质量指数)评价了土壤肥力状况。结果表明:施用生物炭可以改善红壤的理化性状,降低土壤容重,提高土壤的孔隙度、饱和含水量、pH、CEC、有机质、有效磷、铵态氮和全氮及DOC含量;同时提高土壤脲酶、过氧化氢酶和蔗糖酶活性。土壤有效态Cd和Pb含量均随生物炭施用量的增加而减少;而有效态As含量则随生物炭施用量的增加呈先增后减的趋势,三者均在生物炭施用量为40 t/hm^2时为最小值。利用IFI对土壤肥力综合质量进行评价可知,在不同生物炭用量条件下土壤肥力综合质量指数依次为A30>A40>A20>A10>CK,相应的土壤肥力综合质量指数分别为0.64,0.62,0.57,0.47,0.44。评价结果表明在生物炭施用量为30 t/hm^2时,红壤的肥力改良效果最佳。因此,采用适量的生物炭可修复重金属对红壤性水稻土的污染,并改善土壤肥力状况。     

Potential of Gamma Irradiated Sewage Sludge as Fertilizer in Radish: Evaluating Heavy-Metal Accumulation in Sandy Loam Soil

Soil application of sewage sludge as an amendment in crop plants has became a popular method of municipal sewage-sludge disposal in many countries. However, the presence of heavy metals in untreated sewage sludge has raised concerns of adverse effects on crop growth, quality of product, and environmental health. Gamma irradiation is one of the treatments for hygienization of sewage sludge before use as fertilizer. To evaluate the potential of gamma-irradiated sewage sludge as fertilizer in vegetable crops, the field investigation was conducted in a root crop, radish (Raphanus sativus L.), during the 2005–06 and 2006–07 growing seasons in a sandy loam soil. Treatments consisted of three source of fertilizers [farmyard manure (FYM), gamma-irradiated sewage sludge (GISS), and nonirradiated sewage sludge (NISS)]; each were compared at six application levels (1, 3, 6, 7, 9, and 11 t ha^?1). The physicochemical properties of all the three fertilizers used in this study were compared. Growth parameters and yields of radish were not significantly influenced by source of fertilizers or their application levels, except plant stand, which was influenced by type of fertilizers used. There was no significant difference observed between source of fertilizer treatments with respect to any of the measured soil properties, including major nutrients [nitrogen (N), phosphorus (P), and potassium (K)], metallic micronutrients [copper (Cu), iron (Fe), manganese (Mn), and zinc (Zn)], and heavy metals [nickel (Ni), lead (Pb), cadmium (Cd), and cobalt (Co)]. Soil P and Zn were influenced by the various level of fertilizers. However, the interaction effect of source and level of fertilizer was absent for all the measured parameters. The maximum pollutant limits in sewage sludge and soil for agricultural use in different countries were compared. The concentration of metallic micronutrients and heavy metals in soil were less than the prescribed limit of the United States Environmental Protection Agency (USEPA), and no significant accumulation was noted after 2 years of application of GISS and NISS even at higher application rates.     

再生水灌溉对土壤和葡萄品质的影响

2011—2013年,经过3年小区实验,分析了再生水灌溉对土壤和葡萄品质的影响。实验结果表明,再生水区的土壤总氮、总磷和有机质的含量呈现低于清水对照区的趋势,而硝态氮与碱解氮含量却高于清水对照区。再生水灌溉区土壤Cd含量高于清水对照区,而Pb、Cu的含量均低于清水对照区。土壤中重金属有一定的积累现象,但均未超出《土壤环境质量标准(GB 15618—1995)》中的重金属限量值,说明短期再生水灌溉未造成土壤重金属污染。再生水灌溉在一定程度上能提高葡萄的产量,但对葡萄的品质未产生有利的影响。3年实验中,再生水灌溉区葡萄的重金属含量低于清水灌溉区,说明短期再生水灌溉对葡萄重金属含量的影响不大。研究表明再生水可以用作灌溉用水,但再生水中重金属对环境的影响是长期的、积累的、复杂的,要确保再生水灌溉的安全还需进一步研究。     

生物炭对不同酸化水平稻田土壤性质和重金属Cu、Cd有效性影响

针对南方稻田土壤酸化严重,导致养分流失有毒重金属活化,严重影响稻米质量安全的重大现实问题。以水稻秸秆和谷壳等农业废弃物为原料制备生物炭(分别记为RSC和RHC),研究不同原料生物炭对酸化土壤改良及其对重金属有效性的影响。设置3个生物炭用量(0,20,50 g/kg,分别记为CK、C1、C2),4种土壤酸化水平(pH 4.01,4.25,4.33,4.58,分别记为L1、L2、L3、L4),生物炭与重金属污染土壤共同培养60天后测定土壤pH、全氮、有机质、有效磷、速效钾和有效态Cu、Cd含量。结果表明:RSC对酸化土壤pH的改良效果明显优于RHC,且施炭量越高提高幅度越大,RSC的C2处理使4种酸度水平的土壤pH分别提高了0.68,0.97,1.29,1.71个单位。2种生物炭均能提高土壤的全氮、有效磷、速效钾和有机质含量,其中各施炭处理有机质显著提高,尤以速效钾的增幅最为显著,RSC对4种养分的提高均优于RHC。RHC对土壤有效态Cu含量无显著影响;RSC的C2较C1处理更能降低土壤中有效态Cu含量,使4种酸度水平的土壤分别降低了13.62%,6.57%,4.36%,7.88%。RHC处理的L3、L4土壤中有效态Cd含量显著降低,最大分别降低了13.79%,19.23%。RSC使4种酸度土壤有效态Cd含量最大分别降低了20.00%,25.81%,20.69%,19.23%。相关分析表明,土壤pH与有效态重金属含量呈显著负相关关系。水稻秸秆炭用于改良酸化土壤、降低重金属Cu和Cd有效性的效果更佳,且降低污染土壤中Cd的有效性较Cu好;生物炭对酸化程度越低的土壤pH和有效磷含量的提高以及有效态Cd含量的降低效果较好,而有效态Cu含量的降低效果则在酸化程度越高的土壤中表现更佳;土壤pH是生物炭调控重金属Cu、Cd有效性的主要影响因素。     

煤粉尘扩散及As积累对土壤和作物的影响

为了探讨焦化厂煤粉尘扩散对周围农田产生的重金属污染,对焦化厂下风方向农田中沉降的煤粉尘进行收集,对农田土壤的砷含量和pH值进行测定,对农田中生长的玉米进行砷含量测定和光合速率测量。结果表明:在焦化厂下风方向100m范围内的农田中,随着与煤粉尘源距离的不断逼近,煤粉尘的降尘量不断增加,农田的降尘量每年约为1 000kg/hm2;表层土壤的pH值与对照土壤相比,降低了0.35个单位,煤粉尘沉降与积累使得表层土壤有酸化的趋势。随着与煤粉尘源距离的不断逼近,土壤砷含量递增的趋势十分明显,此范围内土壤的总砷含量在8.4～10.9mg/kg之间,与对照土壤呈显著差异,表层土壤总砷含量平均高出对照1.43mg/kg,反映了焦化厂周围土壤中砷含量有不断积累的趋势。煤粉尘扩散还使得焦化厂周围农田玉米叶片和籽粒中砷含量呈现出富积的趋势,10m处的叶片砷含量约为对照处的3倍;玉米籽粒中砷含量平均值高出对照0.011mg/kg,其中10m处的玉米籽粒砷含量约为对照处的2倍。煤粉尘沉降物也不同程度地降低了玉米叶片的光合效率。总之,焦化厂煤粉尘扩散物使周围农田土壤产生了明显的As积累,对土壤质量和玉米生长造成了不同程度的影响。     

堆肥对重金属污染土壤上茼蒿品质和产量的影响

为了解堆肥施人重金属Cu、Cd污染土壤后对蔬菜品质和产量的影响,利用盆栽试验研究了不同堆肥用量下茼蒿品质、产量和重金属含量的变化。结果表明,随着堆肥用量的增加,茼蒿产量、粗蛋白、VC、P和K含量先显著增加后降低,而茼蒿可溶性糖含量呈先显著降低后增加的趋势。堆肥量的增加显著降低茼蒿中Cu含量,比对照最多降低35．5％。茼蒿地上部Cd、根部Cu和Cd含量呈先显著降低又上升的趋势。茼蒿地上部Cd含量在堆肥用量为20g·kg^-1时达最低,根部Cu、Cd含量与对照相比最多分别降低20．1％和39．5％。对于污染地区的茼蒿种植,试验堆肥的适量施用是切实可行的。     

Co-application of Red Gypsum and Sewage Sludge on Acidic Tropical Soils

The agroenvironmental impact of co-utilization of red gypsum and sewage sludge was investigated. Both laboratory and greenhouse studies were conducted. The treatments were soil + sewage sludge (5% w/w) + red gypsum (0, 2.5, 5, 10, 20, and 40%, w/w). Corn was grown in the greenhouse, and the highest rate of red gypsum application was excluded. The residual calcite in red gypsum was able to increase the pH of the red gypsum–sewage sludge acidic soil system. Hence, gypsum reduced the zinc (Zn) concentrations in the soil solution released by sewage sludge. Phosphorus (P) and potassium (K) were insufficient for corn growth. At the rate of 2.5% red gypsum and 5% sewage sludge application, no dry-matter reduction was observed compared to the control. The uptake of Zn, copper (Cu), and iron (Fe) by the corn plants decreased. Therefore, co-utilization of red gypsum and sewage sludge is a better option than using these by-products separately.     

Effects of Byproduct Amendment on Enzyme Activities and Physicochemical Properties of Acidic Orchard Soil from Jiaodong Peninsula of China

Application of byproduct amendment containing silicon, calcium, magnesium, and potassium has been shown to improve acidic soil quality in Jiaodong Peninsula of China. In this study, we explored the influences of amendment supplemented with and without urea on the physicochemical properties as well as microbial activities of acidic soil from Jiaodong over a 120-day period. With the amendment, the electronic conductivity and pH of soils changed. The amendment treatment significantly reduced inorganic nitrogen content and increased microbial biomass nitrogen content during the whole incubation period. The microbial biomass, activities of phenol oxidase and dehydrogenase were increased by the addition of amendments, while the soil respiration, catalase and urease activity were declined. Our results indicated that application of byproduct amendment could improve the chemical and biological properties of the acidic orchard soils from Jiaodong over a short time period of investigation.     

不同改良剂对滨海重度盐渍土质量和肥料利用效率的影响

为揭示不同改良剂对江苏滨海围垦滩涂区重度盐渍土改良与肥料利用的效应,通过田间试验研究生物质炭、石膏、EM菌剂和黄腐酸4种改良剂对土壤表层盐分的时序动态、大麦产量和肥料利用效率的影响。结果表明:盐分对于作物生长和肥料利用具有明显的抑制作用,各改良剂均有效提高了重度盐渍土土壤肥力与作物产量。其中,低量生物质炭处理(10 t/hm2)和高量黄腐酸处理(3t/hm2)整体效果较好。经低量生物质炭处理后,土壤表层(0～20cm)盐分相对于单施化肥处理降低106%,作物产量增加79%,氮肥利用率提高99%;高量黄腐酸处理较单施化肥处理土壤表层盐分降低95%,作物产量增加68%,氮肥利用率提高93%。该结果表明适宜用量的生物质炭和黄腐酸均可用于滨海滩涂重度盐渍土的加速治理培育和肥料利用效率的提升。