Effects of mixed fertilizers formed by the compounding of two targeted controlled-release nitrogen fertilizers on yield,nitrogen use efficiency,and ammonia volatilization in double-cropping rice

One-time application of mixed fertilizer formed by the compounding of two controlled-release nitrogen fertilizers(CRUs)with targeted N supply during the periods from transplantation(TS)to panicle initiation(PI)and from PI to heading(HS)is expected to synchronize the double-peak N demand of rice.However,its effects on the yield and N use efficiency(NUE)of labor-intensive double-cropping rice were unknown.Two targeted CRU(CRU_(A)and CRU_(B))were compounded in five ratios(CRU_(A):CRU_(B)=10:0,7:3,5:5,3:7,and 0:10)to form five mixed fertilizers(BBFs):BBF1-5.A field experiment was performed to investigate the characteristics of N supply in early and late seasons under different BBFs and their effects on N uptake,yield,and ammonia volatilization(AV)loss from paddy fields of double-cropping rice.Conventional high-yield fertilization(CK,three split applications of urea)and zero-N treatments were established as controls.The N supply dropped significantly with the increased compound ratio of CRU_(B)during the period from TS to PI,but increased during the period from PI to HS.With the exception of the period from TS to PI in the late rice season,the N uptake of early and late rice maintained close synchronicity with the N supply of BBFs during the double-peak periods.Excessive N supply(BBF1 and BBF2)in the late rice season during the period from TS to PI increased N loss by AV.The effect of BBF on grain yield increase varied widely between seasons,irrespective of year.Among the BBFs,the BBF2 treatment of early rice not only stabilized the spikelets per panicle but also ensured a high number of effective panicles by promoting N uptake during the period from TS to PI and a high grain-filling percentage by appropriately reducing the N supply at the later PI stage,resulting in the highest rice yield.While stabilizing the effective panicle number,the BBF4 treatment of late rice increased the number of spikelets per panicle by promoting N uptake during the period from PI to HS,resulting in the highest rice yield.The two-year average yield and apparent N recovery efficiency of the BBF2 treatment during the early rice season were 9.6 t ha 1 and 45.3%,while those of late rice in BBF4 were 9.6 t ha 1 and 43.0%,respectively.The yield and NUE indexes of BBF2 in early rice and BBF4 in late rice showed no significant difference from those of CK.The AVs of BBF2 during the early rice season and of BBF4 during the late rice season were 50.0%and 76.8%lower,respectively,than those of CK.BBF2 and BBF4 could effectively replace conventional urea split fertilization in early and late rice seasons,ensuring rice yield and NUE and reducing AV loss in paddy fields.

Effect of Spraying Liquid Mineral Mixed Fertilizers on the Mineral Elements of Potted Poa crymophila cv. Qinghai

Objective] The aim was to explain the accumulation characteristic of mineral elements in alpine grassland plants and the effect of supplementary supply on the nutrient changes of mineral elements. [Method] Potted Poa crymophila cv. Qinghai plants were regularly applied with liquid mineral mixed fertilizers, and samples were collected for analysis and detection. [Result] After the regular spraying of liquid mineral mixed fertilizers, the mineral elements in potted P. crymophila and its soil reduced （ P 〈0.05）, but the accumulation of corresponding mineral elements of P. crymophila in the control group was increased due to the ＂Starvation Effect＂, which was one of the endogenetic forces driving the increase in the accumulation of mineral elements. [Conclusion] This study is of great significance for the study of the accumulation of mineral elements in degraded grassland plants and its dynamic mechanism, as well as testing the hypothesis of the Starvation Effect of mineral elements. In addition, it also provides scientific bases and technical support for the restoration and remediation of degraded grassland and the development of ecological livestock husbandry.

A Mixed Model Analysis of a Fertilizer Experiment on Oil Palm in Nigeria

Mixed model analysis procedure was used to analyze the effect of fertilizer application on the Fresh Fruit Bunch (FFB) yield of oil palm. This was with a view to achieve the most appropriate and a robust model for analyzing yield response for fertilizer application in oil palm. In this study, a mixed model analysis procedure was used to analyze yield data obtained from a fertilizer trial conducted between 1997 and 2005. In mixed effect model, replicates and years were used as block. In contrast the fixed effect ANOVA model usually lumped up replicates and years as a random error. In the model replicates were used as block with no block interaction, replicates as block with allowance for block-fertilizer interaction, years as block with allowance for block-fertilizer interaction, and years and replicates as block with allowance for year fertilizer and replicate-fertilizer interaction. Mixed model theory was also used to provide the explicit description of the design matrices in the models. Also, hypotheses relevant to each model were formulated and used to test for specific effects in the models such as, fixed part, random part and interacting parts using appropriate error terms as determined by the derived Expected Mean Squares (EMS). The results revealed that at 5% significant level (p

Advances in controlled-release fertilizer encapsulated by organic-inorganic composite membranes

Heavy use of conventional fertilizers can lead to negative environmental concerns.Controlled-release fertilizers(CRFs)can effectively reduce the amounts of fertilizers used,improve the availability of fer-tilizers,and which is conducive to the protection of the ecological environment and sustainable devel-opment of agriculture.Therefore,it is imperative to develop and use CRFs as an alternative to traditional fertilizers.This review aims to present the classification,raw material composition,benefits,release process,release mode,and manufacturing methods of fertilizers coated with organic-inorganic com-posite membranes(OICMs)in order to provide an overall update and summarize CRFs encapsulated by OICMs and provide an insight for future trends in the field of fertilizers.It is expected that utilizing CRFs encapsulated by OICMs and their characteristics for agricultural applications can provide innovative ideas and suggestions for developing novel CRFs suitable for modern and sustainable agriculture.

Effects of Combined Organic-inorganic Fertilization on Quality and Water Use Efficiency of Spring Maize under Equal Nitrogen Fertilization

The experiment was conducted in the abandoned land of Liangjia Village,Huayin City,Shaanxi Province from April to September 2019.The experimental crop was spring maize.A total of six treatments were set up in a randomized block design.The moisture content of the top 0-60 cm soil was determined regularly,and the yield and quality indices of maize at maturity were checked.The results show that:(i)combined organic-inorganic fertilization increased the yield of spring maize by 3%-8%.(ii)Compared with CK,fertilization treatments significantly improved the water use efficiency of spring maize,with an increase of 59.2%.The average water use efficiency of three combined organic-inorganic fertilization treatments was 27.81 kg/(ha·mm).Compared with CON,combined application of organic and inorganic fertilizers significantly improved the water use efficiency of spring maize,with an increase of 12.5%.(iii)The combined application of organic and inorganic fertilizers increased the moisture,total starch,crude protein and crude fat contents,and reduced crude fiber content of maize kernels.However,with the increase of the proportion of organic fertilizer,the crude protein content of maize kernels decreased.(iv)Yield of spring maize showed a significant parabolic relationship with soil water consumption.In summary,70%inorganic fertilizer+30%organic fertilizer is a scientific and reasonable way of fertilization.

Yield and Quality Response of Ryegrass, Egyptian Clover and Their Mixtures to Different Sources of Fertilizers

Two field experiments were conducted during two successive winter seasons of 2008/2009 and 2009/2010 to investigate the potentialities of mixing Egyptian clover with ryegrass under bio, organic and mineral fertilization treatments and their combination to increase forage yield and quality grown under sandy soil conditions. The experiment included the combination of five mixing ratios (Egyptian clover alone, ryegrass alone, 75% Egyptian clover: 25% ryegrass, 50% Egyptian clover: 50% ryegrass and 25% Egyptian clover: 75% ryegrass) and eight fertilizer sources, which include control, organic fertilization, bio fertilization, chemical fertilizer, organic + bio fertilizer, organic + chemical fertilizer, bio + chemical fertilizer and combination of organic and chemical and bio fertilizers. The obtained results indicate the superiority of 75% E. clover: 25% ryegrass mixture fertilizedby Bio + O + N in fresh and dry forage production. On the other hand, it reported the lowest dry weight of weeds g/m2. Chemical analysis of forage plants showed that the mixture of ?75% E. clover: 25% ryegrass surpassed that of other treatments yield for crude protein, ether extract and ash. The results also revealed that the highest record of DCP, crude fiber and TDNY was obtained by forage mixture of 75% E. clover: 25% ryegrass fertilized with Bio + O + N. Such higher yield of these characters hassecured a balanced ratio which is really needed for ruminants ration.

孕妇生育动机与主观幸福感及母胎依恋的关系研究

目的分析孕妇生育动机的潜在类别,探讨生育动机与母胎依恋的关系及主观幸福感的中介作用,为提高母胎依恋水平提供参考。方法运用母胎依恋关系量表、总体幸福感量表和生育动机量表对413名妊娠中晚期孕妇进行调查。采用潜在类别分析探讨孕妇的生育动机,多分类自变量中介效应分析检验不同类别生育动机对母胎依恋的直接效应和主观幸福感的中介效应。结果孕妇的生育动机可以分为自主型(23.7%)、控制型(23.7%)、混合型(26.4%)和消极型(26.2%)4个潜在类别。中介效应分析发现,与自主型生育动机相比,控制型和消极型生育动机对母胎依恋的相对直接效应显著(β=-0.519、-0.612,均P<0.05),主观幸福感的相对间接效应显著(β=-0.262、-0.221,均P<0.05),主观幸福感起部分中介作用;而混合型生育动机对母胎依恋的相对直接效应不显著(β=0.176,P=0.117),主观幸福感的相对间接效应显著(β=-0.118,P<0.05),主观幸福感起完全中介作用。结论孕妇生育动机具有明显的分类特征,其对母胎依恋的预测价值及主观幸福感的中介作用也与分类有关,应针对不同人群进行精准干预。

氮肥用量和混播比例对麦豆混播草地饲草产量及种间关系的影响

为研究适宜科尔沁沙地生境下的麦豆混播草地氮肥用量和混播比例,设置0(N0)、70(N70)、140(N140)、210(N210)kg·hm^(-2)共4个氮肥施用水平,100∶0(W0)、80∶20(W20)、70∶30(W30)、60∶40(W40)、50∶50(W50)、0∶100(W100)共6个燕麦与饲用豌豆混播比例处理,进行田间双因素随机区组试验,分析氮肥用量和混播比例及其交互作用对麦豆混播草地产量和种间关系的影响。结果表明:随氮肥用量的增加,燕麦、饲用豌豆和麦豆总产量均呈逐渐增加的趋势,N210处理较其他施氮处理麦豆鲜草总产量提高24.33%~48.24%,干草总产量提高56.91%~111.16%;随饲用豌豆混播比例的增加,燕麦鲜草产量呈降低趋势,饲用豌豆的鲜草和干草产量呈增加趋势,麦豆总产量则呈先增加后降低的趋势,W40处理麦豆饲草产量最高,鲜草和干草产量分别为29.79 t·hm^(-2)和9.06 t·hm^(-2);N210W40处理下,麦豆混播草地产量最高,鲜草和干草产量分别为34.4 t·hm^(-2)和10.53 t·hm^(-2),较其他处理分别提高1.42%~89.32%和0.38%~255.74%。不同混播比例下土地当量比>1,其中W40处理土地当量比最高(1.19);麦豆混播草地中燕麦的相对产量高于饲用豌豆,燕麦的侵略强度高于0。综上,建议在科尔沁沙地采用60∶40麦豆混播比例配合210 kg·hm^(-2)氮肥用量进行麦豆混播草地生产。

大田水肥一体化混肥器设计与试验研究

由于当前市场上没有既适合大田大面积灌溉、混肥精度又高的水肥一体化系统,故在旁路式结构设计中增加静态混合器替换主管道,以提高混肥均匀性为重点进行研究,对混肥部件进行了优化改进。利用混合器自身结构,在不需要外接能源的条件下,使得水肥充分混合,不仅能够满足大面积灌溉要求,而且可以保证混肥精度。基于流体力学及CFD基本原理,通过Fluent软件分析水肥混合过程中SK型静态混合器混合单元数,以及长径比对水肥混合性能和压降的影响,以此找出混合器的最佳结构参数,并对其结构做了改进,设计出了开沟式静态混合器。

施肥对河西走廊豆禾混播草地产量及品质的影响

在河西走廊绿洲灌区,设置不施肥(N0P0K0)、平衡施肥(N2P2K2)、不施氮(N0P2K2)、不施磷(N2P0K2)和不施钾(N2P2K0)5个不同施肥处理,研究其对豆禾混播草地牧草产量和品质的影响。结果表明:与N0P0K0处理相比,4种施肥处理均显著提高了豆禾混播草地的干草产量、营养品质和土壤养分含量,显著降低了中性洗涤纤维、酸性洗涤纤维含量。播种当年和生长第2年N2P2K2处理下干草产量、粗蛋白、相对饲喂价值、土壤有机质、速效氮、速效磷、速效钾含量分别比N0P0K0处理高110.55%、19.72%、12.61%、32.46%、42.58%、85.51%、31.25%和61.17%、18.27%、10.37%、27.68%、33.28%、66.08%、32.00%。中性洗涤纤维、酸性洗涤纤维含量分别比N0P0K0处理低6.26%、6.37%和11.82%、7.71%,且N2P2K2处理的干草产量、营养品质及土壤养分均高于3种偏施肥处理。综合评价显示,河西走廊豆禾混播草地施肥效应表现为:N2P2K2>N2P2K0>N0P2K2>N2P0K2>N0P0K0,磷是该地区生产力最小养分限制因子。

不同混交比例桉树—红锥混交林对林下植被和土壤肥力的影响研究

为探究不同混交比例的桉树Eucalyptus robusta、红锥Castanopsis hystrx混交林对土壤肥力和林下植被多样性的影响,以广东省廉江市石岭林场4种混交比例的桉树—红锥混交林(桉树为华桉一号,红锥为当年生盆栽实生苗)为研究对象,通过野外调查、取样、分析以及综合比较,对不同混交比例下的桉树—红锥混交林的土壤理化性质、林下植被组成和植物多样性进行分析。结果表明,桉树—红锥5∶1混交林林下灌木和草本植物最多,1∶1混交林林下灌木物种组成最少,3∶3混交林林下草本物种组成最少。4种桉树—红锥混交林林下植被Patrick丰富度指数存在显著差异(P<0.05),表现为5∶1混交林显著高于3∶3混交林。3∶1混交林林地的土壤最大持水量最大,其次为5∶1混交林;3∶1混交林的土壤最大持水量在0~20 cm,20~40 cm,40~60 cm,3个土层均显著高于1∶1混交林,在20~60 cm土层均显著高于3∶3混交林;5∶1混交林林地的最大持水量仅在0~20 cm土层显著高于1∶1混交林,在20~40 cm土层显著高于3∶3混交林。桉树—红锥混交林林下植被的Simpson多样性指数在5∶1混交林和1∶1混交林与全磷含量显著负相关;Shannon-Wiener变化度指数在3∶3混交林与全磷含量显著负相关,在1∶1混交林与全磷含量显著负相关;Patrick丰富度指数在3∶3混交林与土壤非毛管孔隙度显著正相关,在3∶3混交林与全氮含量显著负相关;Pielou均匀度指数在3∶1混交林与土壤非毛管孔隙度和土壤通气度均显著负相关,在5∶1混交林与与全磷含量显著正相关。综上所述,5∶1混交比例更适合林下植物的生长,但1∶1的混交比例更适合土壤肥力的保存。

氮磷添加对紫花苜蓿-羊草混播草地生产力的影响

为了明确施肥对混播草地产量稳定性的影响,在旱作基础上研究氮磷添加对内蒙古中西部轻度盐碱地紫花苜蓿-羊草人工混播草地群落特征的影响。结果表明:(1)氮磷添加显著提高了混播草地中紫花苜蓿和羊草的产量,2021年9月和2022年6月混播草地豆禾总产量在施肥处理下均显著高于对照(P<0.05),且均为氮磷处理下的豆禾总产量最高,分别为3.57 t/hm2和4.55 t/hm2,较对照分别提高了59.38%和85.71%。(2)氮磷添加改变了混播草地中紫花苜蓿和羊草的产量占比。2021年6月,氮添加处理下羊草产量占比为56%;磷添加处理和氮磷添加处理下苜蓿产量占比高于羊草,分别为56%和54%。苜蓿的再生速度高于羊草,使得刈割后混播草地的产量占比发生明显改变。2021年9月,苜蓿产量占比在各处理中均超过76%。2022年6月,苜蓿产量占比在各处理中均超过87%。综上所述,氮磷添加可促使苜蓿-羊草混播草地产量增加。苜蓿作为优势种主导了混播草地的生物量,决定了混播草地产量的稳定性。

喷锌方式对冬小麦籽粒锌含量和锌利用率的影响

为探究喷锌方式对冬小麦籽粒锌含量和锌利用率的影响,采用人工(M1)和无人机(M2)两种喷施方式,设置5个锌肥施用水平(M1T0~M1T4处理锌肥浓度分别为0、0.4%、0.8%、1.2%、1.6%;M2T0~M2T4处理锌肥浓度分别为0、2.5%、5%、7.5%、10%)和3个锌氮磷肥配施的处理(M1T5:0.4%ZnSO_(4)·7H_(2)O+0.2%K_(2)HPO_(4);M1T6:0.4%ZnSO_(4)·7H_(2)O+2%尿素;M1T7:0.4%ZnSO_(4)·7H_(2)O+0.2%K_(2)HPO_(4)+2%尿素;M2T5:2.5%ZnSO_(4)·7H_(2)O+1.25%K_(2)HPO_(4);M2T6:2.5%ZnSO_(4)·7H_(2)O+12.5%尿素;M2T7:2.5%ZnSO_(4)·7H_(2)O+1.25%K_(2)HPO_(4)+12.5%尿素),人工和无人机单次喷施药液量分别为375和60 L·hm-2,通过田间试验比较分析了不同处理下冬小麦籽粒锌含量、锌携出量、光合速率、产量等性状的差异。结果表明,同一喷锌量下,人工喷施时冬小麦籽粒锌含量、锌携出量显著高于无人机喷施处理;同一喷施方式下,随着锌肥浓度的提高,籽粒锌含量和锌携出量均呈上升趋势,但无人机喷锌浓度高至10%时对籽粒锌携出量的提升作用反而减弱,旗叶净光合速率、穗粒数、籽粒收获指数和产量也显著降低。与单一施锌相比,人工和无人机锌氮配施均显著提高籽粒锌携出量和锌利用率,且M2T6处理的籽粒产量较M2T1处理显著增加,增幅22.68%。以上结果说明,相同喷锌量下,人工喷施对籽粒锌元素的强化效果优于无人机,但是采用无人机喷施时,将2.5%浓度的硫酸锌溶液与12.5%的尿素溶液配合施用,可实现籽粒产量和锌含量的同步提高。

0.3%精甲霜灵·噁霉灵SP药肥防治辣椒猝倒病及对生长的影响

0.3%精甲霜灵·噁霉灵可溶粉剂药肥是集杀菌剂与肥料优势于一体的产品,采用滴灌施药的方式,研究其对辣椒苗期猝倒病的防治效果和植株生长影响。结果表明:在90和75 kg/hm^(2)滴灌施用量下,0.3%精甲霜灵·噁霉灵可溶粉剂药肥均对辣椒生长具有明显促进作用,平均株高、平均茎粗、根鲜质量、根干质量和壮苗指数均显著高于空白对照,而且促生作用优于18.7%吡唑醚菌酯·烯酰吗啉WG 1.5 kg/hm^(2)+水溶肥75 kg/hm^(2)(CK3)。该药肥均对苗期猝倒病具有较好的防治效果,在处理两次后,2个施用量下的防治效果分别达到89.15%(75 kg/hm^(2))和89.68%(90 kg/hm^(2));死苗率分别为4.34%(75 kg/hm^(2))和4.23%(90 kg/hm^(2))。75和90 kg/hm^(2)的施用量相比较效果差异不显著,因此0.3%精甲霜灵·噁霉灵可溶粉剂药肥75 kg/hm^(2)的施用量符合生产上推广应用要求。

预拌流态固化土在软土地基肥槽回填中的应用

软土地基基坑支护普遍采用围护桩+混凝土内支撑的支护形式,而为了保证基坑受力稳定,深基坑工程存在拆撑和换撑的施工工序,最终导致基坑肥槽周围存在密集换撑板带。同时肥槽空间宽度狭窄也常导致肥槽出现回填施工难度大、施工质量问题多、施工进度慢等问题。本研究通过常见肥槽回填材料方案对比分析,结合实际工程的场地道路条件和支护结构特点,提出预拌流态固化土回填施工方案,不仅保证了项目顺利施工,还取得良好的经济效益。

紫云英与油菜混播还田对湘南稻田的影响

为探究湘南地区稻田中紫云英与油菜混播对后茬水稻产量以及土壤养分的影响,本试验设置6个处理,分别为冬闲(CK)、单播紫云英(LF01)、单播油菜(LF02)和紫云英油菜混播(LF03—LF05),对比分析各处理组绿肥生物量、后茬水稻产量及土壤理化性状等。结果表明,紫云英与油菜混播处理的绿肥生物量明显高于单播处理,其中紫云英播种量22.5 kg/hm^(2),油菜播种量3.0 kg/hm^(2)(LF04)时效果最佳,较紫云英单播和油菜单播分别增加120.9%和39.3%;同时LF04处理较CK处理后茬水稻产量增加17.5%;土壤中有机质、碱解氮、有效磷和速效钾含量分别提升了9.6%、8.1%、7.5%和9.6%。在湘南地区,相比紫云英、油菜单独播种,紫云英与油菜混播能够有效提高后茬水稻产量、改善土壤肥力,是一种有效的种植模式,适宜在该地区推广。

有机肥料中总氮含量测定的前处理方法对比研究

行业标准《有机肥料》(NY/T 525—2021)中测定有机肥料的总氮含量采用浓硫酸-过氧化氢消煮法处理样品,不仅耗时长,而且操作复杂。参考国家标准《复混肥料中总氮含量的测定蒸馏后滴定法》(GB/T 8572—2010)中的硫酸-混合催化剂消化法,采用上述2种方法分别消解有机肥样品,用凯氏定氮法测定有机肥中总氮的含量。结果表明:2种方法平行测定结果的绝对差值均符合标准要求,且准确度较好;硫酸-混合催化剂消化法操作简单,消解时间短,检测效率高,可用于大批量有机肥样品总氮含量的测定;浓硫酸-过氧化氢消煮法得到的消解液不仅可用于总氮含量的测定,还可用于总磷和总钾含量的测定,而硫酸-混合催化剂消化法得到的消解液只能用于测定总氮含量。

不同施肥处理下桉树混交林土壤肥力评价

以桂西南地区广西国有派阳山林场桉树混交林为研究对象,监测其土壤pH值、有机质、全量养分和速效养分等8个化学性质指标,采用秩和比综合评价法、优劣解距离法、主成分分析法,因子分析法和熵值法5种土壤肥力质量评价方法,对比验证不同评价体系和模型,探讨桉树混交林土壤肥力质量现状。结果表明:(1)综合5种评价方法,桉树混交林土壤综合评价比较为:B1>B>B2>A1>A>A2,提质组土壤肥力显著高于常规组,上层土壤肥力显著高于下层土壤。(2)5种评价方法中,秩和比综合评价法、熵值法和因子分析法3种评价方法土壤肥力评价排名完全一致。其中秩和比综合评价法线性模型表现优秀、构建良好。(3)8个土壤化学性质指标的权重比较为:全钾>速效磷>全磷>全氮>速效钾>速效氮>有机质>pH值。权重排名前三的全钾、速效磷和全磷占比54.9%。(4)土壤化学性质指标变化幅度较大,其中有机质、全氮和速效氮、全钾和速效钾养分分级标准均跨越了3个或以上等级,全磷和速效磷均表现为低或很低水平,pH表现为酸性或强酸性水平。(5)提质组A土壤呈现出酸性、有机质中等,全量元素分别为极高、低和高等级,速效元素分别为极高、极低和很高等级;常规组B土壤呈现出酸性、有机质中等,全量元素分别为高、高和很低等级,速效元素分别为极高、极低和低等级。提质组对照常规组,土壤酸性下降了4.64%,有机质、全氮和全钾分别提升了19.35%、52.37%和777.33%,速效磷和速效钾分别提高了173.41%和340.76%,全磷和速效氮含量则相反,提质组较常规组下降了27.53%和4.12%。

Effects of mixed rare earth fertilizer on yield and nutrient quality of leafy vegetables during different seasons

Using Chinese cabbage and rape as test material and examining the same soil conditions at different seasons（spring and autumn）, the effects of mixed rare earth fertilizer on the yield and nutrient quality of leafy vegetables were studied to provide a theoretical basis for the application of mixed rare earth fertilizer in agriculture. Results showed a seasonal difference in the nutrient quality of Chinese cabbage and rape. For crops planted in autumn, the soluble sugar and vitamin C content were higher, the titratable acid and nitrate content were lower, and the sugar acid ratio was higher relative to crops planted in spring. Mixed rare earth treatments promoted growth of both crops during both seasons. The plot yield, stem and leaf fresh and dry matter weight, and dry and fresh ratio increased. These increases for Chinese cabbage were greater in autumn than in spring while for rape, the increases were greater in spring than autumn. The soluble sugar content, titratable acid content and sugar acid ratio were increased and the nitrate content decreased, in autumn the effects were more obvious than in spring. In spring, the vitamin C content was increased, and the increase was greater for Chinese cabbage than rape. In autumn, the vitamin C content decreased, and the decrease was greater for rape than Chinese cabbage. At the same time, the content of heavy metals such as Cu, Zn, Cd, Pb and Ni in stems and leaves decreased. This decrease was greater in spring for Chinese cabbage and in autumn for rape.