氮肥运筹、配施有机肥和坐水种对春玉米产量与养分吸收转运的影响

采用田间试验方法,研究了氮肥运筹、配施有机肥和坐水种对春玉米产量与养分吸收转运的影响。结果表明,适宜氮肥运筹方式、配施有机肥和坐水种均能显著增加春玉米产量,氮肥两次追肥处理的产量较一次追肥处理的产量增加10.6%～17.0%,配施有机肥增产10.3%～18.0%,坐水种增产9.1%,配施有机肥并坐水种增产20.4%。氮肥两次追施、配施有机肥及配施有机肥并坐水种均能显著提高春玉米干物质最大积累速率和积累总量,分别提高干物质最大积累速率11.1%～29.5%、28.0%～28.8%和32.1%,依次提高干物质积累总量11.9%～15.5%、21.2%～24.4%和26.9%。氮肥两次追施、配施有机肥和坐水种均可提高N、P、K养分最大吸收速率和吸收总量,养分最大吸收速率以K最高,N居中,P最低;养分吸收总量以N最高,K居中,P最低;养分最大吸收速率出现的时间以K最早（57.2～60.4 d）,N居中（65.3～68.5 d）,P最晚（71.4～74.8 d）,三者均早于干物质积累最大速率出现的时间（82.5～89.3 d）。氮肥两次追施、配施有机肥和坐水种均有利于N、P、K养分由营养体向籽粒的转运量、转运效率、籽粒中养分含量以及氮肥利用率的提高,养分转运效率以P最高（59.3%～66.1%）,其次是N（41.5%～55.1%）,K最低（35.9%～38.0%）。在本实验条件下,施氮量为225 kg/hm2,基肥:拔节肥比1:3,配施有机肥结合坐水种,为最佳施肥处理。     

DYNAMICS OF FABA BEAN GROWTH AND NUTRIENT UPTAKE AND THEIR CORRELATION WITH GRAIN YIELD

Growth parameters and nutrient uptake of faba bean with 12 different genotypes were studied at the end of four subsequent growth periods, viz. first vegetative (V1), second vegetative (V2), first reproductive (R1) and second reproductive (R2) periods for two years and correlated with final grain yield. All parameters including plant height, leaf number, leaf area index (LAI), above ground plant dry matter (DM) and root DM, nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) uptake and concentration of N, P, K, Ca, and Mg showed different patterns with advancement of the growth period. All the mentioned parameters were fitted in either quadratic or linear equations. Significant correlations were found among nutrients, growth parameters and grain yield during different growth stages. On the basis of these experiments it was clear that nutrient uptake was directly related to biomass. In V2 and R1 biomass production was greatest resulting in high nutrient uptake. Among the growth parameters, biomass and LAI showed the highest significant correlation with grain yield. The findings especially models derived from two year data across twelve genotypes can be used for better fertilizer management of faba bean.     

不同基因型抗虫棉氮磷钾养分吸收与分配特征

【目的】探讨不同抗虫棉品种植株干物质与氮、磷、钾养分积累分配特点,为制定棉花高产栽培管理措施提供依据。【方法】在大田条件下,选用三个抗虫棉品种(冀棉169、鲁棉研21号和岱字棉99B)为研究对象,比较研究了三个品种的干物质积累与氮磷钾吸收特性。【结果】冀棉169产量最高,两年分别比鲁棉研21号提高了27.9%和25.5%,分别比岱字棉99B提高了65.9%和41.1%。三个品种单铃子棉重的变化趋势与产量一致,而单株结铃数和衣分则不同。冀棉169棉株各器官干物质和氮磷钾积累量均较高,尤其在生育中后期,营养器官保持最高的氮磷钾养分积累量,促使其干物质积累量显著高于其他两个品种,为棉铃发育提供了充足的物质基础,铃叶比较大,因此结铃最多,单铃子棉重最大,皮棉产量最高,使得养分利用效率也最高。鲁棉研21号棉株各器官干物质和氮磷钾积累量均最低,主要是由于营养器官氮磷钾养分快速积累期结束最早,加之向棉铃分配比例最高,从而限制了营养器官的生长发育,影响生育中后期棉铃的发育,使之不仅结铃数最少,单铃子棉重较小,产量也较低。岱字棉99B棉株各器官干物质和氮磷钾积累量虽最高,但其快速积累期出现在盛花期以后,棉株贪青,结铃数虽较多,但单铃子棉重最小,使之产量最低,养分利用效率也最低。【结论】不同年代抗虫棉品种产量提高的主要原因是单铃子棉重的增加,其次是单株结铃数的提高。单铃子棉重和单株结铃数的增加主要归因于棉株总生物量和向生殖器官转运量的协同提高,特别是生育中后期保持高的同化物和生殖器官运转比例;而生物量的增加依赖于养分积累量和利用效率的提高。     

不同水、氮供应条件下夏玉米养分累积动态研究

在遮雨棚内进行了微区试验,采用不同水、氮素供应研究了玉米N、P、K吸收累积动态。结果表明,植株生物量和N、P、K吸收量,随生育期延长而持续增加;而植株的N、P、K含量,则呈下降趋势。植株生物量和N、P、K吸收量随时间的变化,可用S曲线方程描述。玉米生长期间干物质与养分吸收并非同一速率,前期上升快,至最高峰后缓慢下降。在N、P、K三要素中,N、K吸收速率高,上升快,下降也快;P吸收速率低,上升慢,下降亦慢。养分最大吸收速率出现的时间以K最早,N次之,P最晚。但三者均早于干物质最大累积速率出现的时间。水分和氮素供应增加养分最大吸收速率及养分吸收量,也可增加生育前期的养分含量,但不改变养分累积变化趋势和养分吸收速率的变化趋势。水分和氮素供应促进了营养体养分向子粒的运转,提高了养分在子粒中的分配比例,从而提高了子粒产量。     

施氮模式对春玉米养分累积特性的影响

通过田间试验,研究了施氮模式对春玉米养分累积特性的影响.结果表明,施氮明显提高了春玉米干物质和NPK的累积量及累积速度,这种影响均在拔节期以后更明显.随着生育期推进,春玉米干物质及NPK的累积量均增加,但增加幅度不同.干物质及NP累积量的增加幅度在大喇叭口期以前较小,大喇叭口期以后较大;K累积量的增加幅度则正好相反,大...     

Effect of Application of Different Types of Organic Composts on Rice Growth under Laboratory Conditions

In the present study, pot experiments were conducted to evaluate the effects of the application of two different kinds of composts: pea-rice hull compost (PRC) and cattle dung-tea compost (CTC) on rice growth. These composts differed in their nitrogen composition, as well as in their effect on plant height, number of tillers, dry matter yield and nutrient uptake (nitrogen (N), phosphorus (P), potassium (K)) of rice plants. Plants were cultivated in 1/5,000 Wagner pots, which contained 3 kg of soil, completely mixed with the composts (PRC 404 g; CTC 380 g) and chemical fertilizer (CHEM), respectively in the first crop. The residual effect of the composts was studied after the plants of the first crop were harvested. All the treatments were replicated four times, with a randomized complete block design. The nutrient concentrations in the roots, leaf sheaths, leaf blades, stalks, and grain were analyzed at different growth stages. At the most active tillering and heading stages of the plants of the first crop, the number of tillers, dry matter yield and the amount of nutrients absorbed from the CHEM treatment were found to be higher than those in the other treatments. The values of the plant height, straw growth and nutrient uptake of the rice plants with the PRC treatment were the highest among all the treatments at the maturity stage. In the plants of the second crop, the values of the plant height, number of tillers, straw and whole plant yield and the N and K uptake from the PRC treatment were the highest among all the treatments at the heading and maturity stages. The chemical fertilizer was a fast-release fertilizer used to supply nutrients at the early stage of rice growth in the first crop. The beneficial effect of the composts on rice growth and nutrient uptake was conspicuous in the second crop, compared with that of routine treatment of chemical fertilizer.     

肥料与石膏配施对滨海盐土油菜生长及养分吸收的影响

通过盆栽试验,研究了肥料与石膏配合施用对滨海盐土油菜生长及养分吸收的影响,探讨了滨海盐土适宜的肥料品种。结果表明,肥料与石膏配合施用对滨海油菜生长有显著影响,在油菜干物质累积、油菜产量上均以有机无机复混肥、生物有机肥配合无机复混肥配施石膏效果最好。供试肥料品种间,油菜生长中后期在干物质累积、产量上均表现出有机无机复混肥(F2)、生物有机肥配合无机复混肥(F4)>无机复混肥(F1)>生物有机肥(F3)>对照,各肥料较对照分别增产195.6%、190.9%、117.0%和53.4%。在有机无机复混肥、生物有机肥配合无机复混肥的基础上增加石膏的施用量可明显改善油菜生长状况和产量,但在无机复混肥基础上增加石膏施用量会导致油菜干物质累积和产量的明显降低。肥料与石膏配合施用影响油菜对N、P、K养分的吸收,在油菜苗期养分吸收上,N、K以无机复混肥(F1)较高,P以有机无机复混肥(F2)较高,施用石膏可促进油菜对N、K的吸收,但会显著降低对P的吸收量。滨海盐土地区油菜栽培以有机无机复混肥(F2)、生物有机肥配合无机复混肥(F4)配合石膏(B2)施用较为适宜。     

钾素营养对玉米生育后期干物质和养分积累与转运的影响

为揭示钾素营养与玉米产量形成的关系,研究了3个施钾水平（K2O　0、113和225 kg/hm2）对玉米生育后期植株不同器官干重及氮、磷、钾积累和转运的影响。结果显示,施钾能显著提高玉米产量。随着施钾量的增加,玉米生育后期干物质积累的最大速率和平均速率提高,最大速率出现时间提前。玉米干物质在各器官中的分配比例随生长发育中心的转移而变化。生育后期干物质和养分由营养体向子粒转运,其中干物质和氮、磷主要来源于穗部营养体的转运,而钾则主要来源于叶片的转运。子粒中氮、磷、钾的积累量分别占总积累量的50.3%～57.1%,59.6%～67.2%和14.0%～33.3%。施钾不但能增加子粒中干物质和氮、磷、钾养分的分配比例,而且还有助于提高干物质和氮、磷、钾养分向子粒转运的转运率。氮的转运率以K1处理最大,为45.7%;干物质、磷和钾的转运率以K2处理最大,分别为7.4%、62.6%和22.4%;子粒养分中54.5%～60.6%的氮,56.0%～85.8%的磷及52.4%～100.0%的钾可以依赖于营养体的转运。     

Growth,yield and nutrient uptake of taro grown under upland conditions

There is a scarcity of basic information on dry matter accumulation by various plant organs, nutrient uptake, and yield of taro [Colocasia esculenta (L.) Schott] grown under upland conditions. These data are essential for the development of technological packages, growth simulation models, and decision support systems designed to promote agrotechnology transfer of the crop in the tropics. Two taro cultivars were planted and harvested for biomass about every six weeks during the growing season. At each harvest, plants were separated into various plant parts and their dry matter and nutrient content were determined. There were no significant differences (P<0.05) in total and edible dry matter content between cultivars. However, cultivar ‘Lila’ absorbed significantly smaller amounts of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and zinc (Zn) than cultivar ‘Blanca’, suggesting that it had a higher nutrient‐use efficiency. Fresh corm yields were not significantly different and averaged 20,221 kg/ha for both cultivars.     

红芸豆养分限制因子及养分吸收、积累和分配特征研究

研究红芸豆养分限制因子、植株干物质和氮、磷、钾养分积累及分配规律,可为红芸豆合理施肥及高产栽培提供理论依据。大田试验条件下,以‘英国红’红芸豆为试材,设置缺素试验,采集全施肥区植株样品,分析研究红芸豆不同生育时期各器官干物质量、养分含量及积累量。结果显示,氮磷钾配合全施显著提高红芸豆产量;缺氮、缺磷、缺钾处理与全施肥处理相比,产量分别降低14.2%、8.0%和11.3%,表明影响红芸豆产量的限制因子为氮钾磷。在整个生育期,红芸豆干物质累积速率先升高后降低;根、茎、荚皮和豆粒干物质累积量呈上升趋势,叶干物质在收获期有下降趋势,收获时不同部位干物质量为豆粒茎≈荚皮叶片根。随生育期推进,茎、叶和荚皮中氮含量呈递减趋势,豆粒中氮含量呈递增趋势,而各器官磷、钾含量呈递减趋势。盛花期到结荚期是养分累积最大期,其氮、磷、钾吸收量分别占整个生育期吸收总量的28.14%、49.22%和56.20%;不同器官吸收累积氮、磷、钾量不同,成熟期豆粒、叶、茎和根中均为累积氮最多、钾次之、磷最少,荚皮中累积钾最多、氮次之、磷最少。每生产100 kg红芸豆需供给N 4.37 kg、P2O5 2.38 kg、K2O 3.53 kg,比例为1∶0.54∶0.81。     

供镁水平对烤烟生长及养分吸收的影响

采用盆栽土培试验研究了不同供镁水平对烤烟生长和养分吸收的影响。结果表明,施MgSO4量为0.06～1.08 g/kg时,各处理烤烟的生长状况和干物质积累量明显优于对照和施MgSO4 1.88 g/kg。烤烟各器官对钾的吸收最多,氮次之,磷最少,各处理表现一致。施MgSO4量为0.18～0.72 g/kg的3个处理烤烟各器官对氮磷钾的吸收量明显高于其他处理,且在施MgSO4量为0.36 g/kg时达到峰值。当施MgSO4量较低（≤0.06 g/kg）或较高（MgSO4≥1.08 g/kg）时都会抑制烤烟的生长发育、干物质和养分的积累。而烤烟各器官对镁的吸收量则均表现出随施镁量增加而增加的趋势,且各器官镁吸收量表现为:叶＞茎＞根;镁肥的施用能够在一定程度上促进烤烟对镁素的吸收。     

Quantitative determination of NPK uptake requirements of taro (Colocasia esculenta (L.) Schott)

Taro yield in many parts of the world is stagnant mainly due to conventional blanket recommendation of fertilizers, lower nutrient use efficiency and imbalance in the use of nutrients. The Quantitative Evaluation of Fertility of Tropical Soils (QUEFTS) model was used for determining the region specific balanced NPK uptake requirements and recommendations for a target yield of taro. The constants for minimum and maximum accumulation (kg cormel kg^?1 nutrient) of N (33 and 177), P (212 and 606) and K (25 and 127) were derived as standard model parameters. The results showed that taro requires N, P and K accumulation of 12.97, 2.75 and 17.47?kg t^?1 of cormel yield, suggesting an average NPK ratio in the plant dry matter of about 4.7:1:6.4. The NPK fertilizer requirements for different potential yield situations were also calculated. The results need to be validated in major taro growing regions.     

Foliar potassium,calcium, magnesium,zinc, and manganese content in soybean cultivars at different stages of development

Plant tissue accumulation of potassium (K), calcium (Ca), magnesium (Mg), zinc (Zn), and manganese (Mn) was determined for six soybean [Glycine max (L.) Merr.] cultivars at successive stages of development. No nutrient accumulation patterns among the cultivars were found. The results obtained showed that the highest concentrations of K were found at the vegetative stage (V) and the lowest towards the end of the life cycle of the plant (R55). By contrast, Ca was lowest at the vegetative stage while increasing in the leaves in later growth stages. No significant differences in Mg content were found between growth stages. Manganese levels were lower at R2 and R4 than at R55 stages of growth with an accumulation towards the end of the reproductive cycle. Changes in Zn content between stages were different for each cultivar. The differing behavior of these elements is related to the difference in their mobility and transport capacities within the plant.     

底肥分层条施提高冬小麦干物质积累及产量

【目的】探讨底肥按比例分层条施对冬小麦群体动态变化、干物质积累与分配及籽粒产量的调节作用,为创建合理的耕层供肥条件提供理论依据。【方法】于2014～2015年和2015～2016年冬小麦生长季,在大田条件下,设置5种底肥施用方式:不施底肥 (T1);底肥单层条施在地表下8、16和24 cm (T2、T3和T4);底肥按1∶2∶3分为三份,分别施在地表下8、16和24 cm土层 (T5)。各处理均于拔节期随灌溉水追施氮肥,施肥量一致。调查了小麦关键生育期的生长和发育状况以及养分利用率。【结果】底肥单层条施时,在一定范围内随施肥深度增加,冬小麦分蘖和成穗数减少,但穗粒数显著增加,开花后干物质同化量提高,成熟期单茎干物质在各器官中的分配量增加,尽管开花后营养器官贮存的干物质向籽粒中的转移再分配受到抑制,但籽粒产量仍有一定程度的提高。与T4相比,T5的穗粒数和千粒重无明显变化,但植株分蘖和成穗数显著提高,开花后单位面积干物质积累量和籽粒产量均显著增加。【结论】通过优化养分在耕层土壤的分布,调节各生育阶段的养分供给,进而协调开花后干物质同化与营养器官临时贮存干物质再分配,及穗数与穗粒重之间的关系,在增加穗数的同时仍保持较高的穗粒数和千粒重,是底肥按比例分层条施实现冬小麦高产的重要原因。     

Dry matter accumulation and partitioning in cotton (<Emphasis Type="Italic">Gossypium hirsutum</Emphasis> L.) as influenced by potassium fertilization

The effect of potassium (K) supply on dry matter accumulation and partitioning of biomass between different among parts of cotton (Gossypium hirsutum L.) was determined under irrigated conditions. The treatments were four cotton cultivars (CIM-448, CIM-1100, Karishma, and S-12), four K rates (0, 62.5, 125, and 250 kg K ha⁻¹), and two K-fertilizer sources (K₂SO₄, KCl). Sequential harvests were collected at four stages of growth, viz first flower, peak flowering, first boll split, and maturity. The dry weights (DW) of vegetative and reproductive organs were determined. Maximum total DW was obtained at 125 days after planting, and then it declined because of leaf senescence at maturity. Cultivars differed significantly among themselves in the production of total DW and its partitioning between different organs. The addition of K fertilizer increased DW substantially at various stages of growth. Potassium fertilizer stimulated cotton plant to translocate resources towards reproductive organs rather than vegetative organs. Crop receiving 250 kg K ha⁻¹ allocated 77% more dry matter into reproductive organs. The K-sources produced a little effect on the allocation of DW in various parts of the plant. Maximum reproductive–vegetative ratio (RVR) was maintained by cv CIM-448 and minimum in cv CIM-1100. Data showed that a shift in DW allocation into reproductive organs was dependent upon sustained supply of K⁺ throughout the season. There were positive significant correlations (0.86, 0.71, and 0.90) between seed cotton yield and total DW, vegetative DW, and reproductive DW, respectively.     

Quantification of Dry-Matter Accumulation and Nutrient Uptake Pattern of Short Day Onion (Allium cepa L.)

Understanding the physiology of dry-matter accumulation and nutrient uptake pattern of an onion crop is an essential criteria for optimizing fertilizer practices. An experiment was conducted to estimate the dry-matter accumulation and nutrient uptake pattern of short day onion. The dry-matter accumulation and nutrient uptake followed the sigmoid growth curve pattern. Uptake of nitrogen and potassium was slow for the first 15 days followed by rapid uptake from 15 to 60 days after transplanting and accounted for 76.2–78.2% of total uptake. Takeup of phosphorus, sulfur, manganese, zinc, and copper uptake was greater during 30 to 75 days after transplanting and accounted for 64.9–70.6% of total uptake. The deficiency of nutrients during these period reduces the crop yield significantly. The dry-matter accumulation and nutrient-uptake pattern reported in this study provide an opportunity for optimizing quantity and timing of nutrient application through fertilizers for short day onions.     

菌肥减施对结球甘蓝养分吸收及利用的影响

为探讨功能菌型复合肥及化肥减量条件下栽培蔬菜的养分吸收特性及利用特征,在露地和大棚种植体系下,以结球甘蓝为试验材料,采用田间小区试验研究不同养分配比功能菌型复合肥及减量施用对结球甘蓝物质积累、养分吸收及肥料利用率的影响。结果表明,不同种植体系下,施肥处理对结球甘蓝生长后期干物质累积及N、P、K养分吸收速率,收获期N、P、K累积及肥料利用率效应显著。与常规施肥处理相比,露地和大棚种植体系下施用功能菌型复合肥处理结球甘蓝收获期干物质累积量分别增加2.4%~5.7%和4.9%~10.8%,N肥吸收利用率分别增加10.8~35.4和9.4~57.6个百分点。减量25%功能菌型复合肥处理较等量处理结球甘蓝N累积量分别增加2.6%~2.7%(露地)和4.4%~10.8%(大棚),P累积量分别增加1.6%~1.9%(露地)和7.0%~8.2%(大棚),K累积量分别增加1.5%~2.3%(露地)和0.9%~2.0%(大棚)。结球甘蓝各生育阶段对N、K(露地)吸收速率变化表现为结球-收获期>莲座-结球期>苗期-莲座期,而对P、K(大棚)吸收速率变化表现为莲座-结球期>结球-收获期>苗期-莲座期。施用功能菌型复合肥在一定程度上能有效增加不同种植体系中结球甘蓝植株N、P、K养分吸收速率及养分累积,从而提高蔬菜的肥料利用效率。总体而言,在不同种植体系下,施用不同养分配比功能菌肥可有效提高结球甘蓝的物质积累、养分吸收及肥料利用率,且适宜减量施用能进一步增加其作用效果,但应根据土壤肥力特征、作物需肥特性及栽培管理模式合理地进行选择施用。     

Extended probability model for dry matter and nutrient accumulation by crops

Accumulation of dry matter and plant nutrients by crops over the growing season is important to resource management for agricultural production and for meeting environmental standards. It is becoming more common in agricultural and environmental management to use mathematical models to describe such systems. In this article, an extended probability model was used to characterize accumulation of dry matter and plant nutrient uptake, both of which exhibited sigmoid behavior with time. Data from field studies included corn (Zea mays L.), tobacco (Nicotiana tabacum), and soybean (Glycine max). For the case of corn, it was shown that maximum total plant dry matter at maturity agreed very closely for the three sites. The ratio of the paramters mean time to standard deviation of the distribution was very similar for dry matter and plant nutrient accumulations, with an average of 3.6 for Wooster, OH and 3.5 for Clayton, NC. The ratio was 4.3 for water reuse at Tallahassee, FL. For tobacco, the ratio was also very similar for dry matter and plant nitrogen (N) and potassium (K), and was 3.2 at Raleigh, NC. The ratio was 2.9 for leaf area of soybeans grown at Gainesville, FL. Data for dry matter and plant nutrient accumulation followed the sigmoid shape of the model rather well. The model also produced the “hump”; often observed in plant nutrient concentration during early stages of growth. The probability model suggests that for the crops studied, growth rate followed a gaussian distribution over the season, at least to first approximation.     

Dry matter production,nutrient uptake,and growth of cotton as affected by potassium fertilization

Insufficient potassium (K) nutrition produces detrimental effects on cotton (Gossypium hirsutum L.) lint yield and fiber quality. To further understand the deleterious effects caused by K deficiency, a 2‐yr (1991 and 1992) field study was conducted to determine how dry matter partitioning and nutrient concentrations of various plant tissues for the cotton genotypes, ‘DES 119’ and ‘MD 51 ne’, were altered by varying the application rate of fertilizer K and nitrogen (N). All plots received a preplant application of 112 kg N ha^‐1, and half of the plots were later sidedressed with an additional 38 kg N ha^‐1. Within each N treatment, half the plots received 112 kg K ha^‐1, preplant incorporated, with the remaining plots not receiving any fertilizer K. Dry matter harvests were taken three times in 1991 and two times in 1992. At cutout (slowing of vegetative growth and flowering), plants that received K fertilization had a 14% more leaf area index (LAI), a 3% increase in the number of main stem nodes, and a 2% increase in plant height. However, those plants had a 12% lower specific leaf weight (SLW) than plants receiving no K fertilization. By the end of season, the of K fertilization had resulted in more stem (21%), bur (13%), seed (19%), and lint weight (20%), but harvest index was not affected. Varying the level of N fertilization did not affect any of these dry matter parameters at any harvest. In general, the larger plants produced under K fertilization had reduced concentrations of N, phosphorus (P), magnesium (Mg), and sodium (Na) in the various plant parts. While N uptake efficiency was not affected by K fertility, plants that received K fertilization had increased efficiency of fertilizer N use and of N utilization within the plant. The smaller LAI of the K deficient plants probably reduced the photosynthetic capacity per plant. A reduced assimilation capacity could explain the inefficiency of N use, lint yield reductions, and poorer fiber quality often associated with K deficiencies.     

The effect of potassium on yield,nutrient uptake and efficiency of teff (Eragrostis tef Zucc. Trotter) on vertisols of North Western Ethiopian Highlands

Vertisols are characterized by deficiency of nutrients and recently, potassium (K), a major plant nutrient in crops, is gaining attention because of crop removal, fixation by clay minerals and leaching. A field experiment was conducted during the 2015 and 2016 main cropping seasons to test the effect of potash fertilizer on Vertisols of East Gojjam at Gudalima and Dejen/Tik sites using teff crop. The K rates (applied as muriate of potash) were 0, 50,100, and 150?kg ha^?1. The experiment was laid out in a randomized complete block design in three replications. The results indicated that the plant height, panicle length, number of effective tillers, dry matter and grain yield of teff increased significantly (P?<?0.05) with applied K. The highest dry matter and grain yield (6966.4 and 2418.2 kg ha^?1, respectively) were obtained from the application of 100 kg ha^?1 KCl. Total uptake of N, P, and K were enhanced significantly with K treated plots than those without and K efficiency was improved due to the rate of K. The present study demonstrated the importance of K application to supplement NPS for optimum dry matter and grain yield of teff on Vertisols of the study sites.