不同基质配比对盆栽香菜生长及品质的影响          下载免费PDF全文

余婷  陈鹏飞  闵腾辉  王前贵  田强  秦勇 《农业工程》2021,11(1):112-118

以“大叶香菜”为试验材料,设置T1（草炭∶蛭石∶珍珠岩=3∶1∶1）、T2（草炭∶蛭石∶珍珠岩∶有机肥=6∶1∶1∶2）、T3（草炭∶蛭石∶有机肥=3∶1∶1）、T4（草炭∶蛭石∶珍珠岩∶有机肥=2∶1∶1∶1）、T5（草炭∶蛭石∶珍珠岩∶有机肥=1∶1∶1∶1）和T6（草炭∶蛭石∶有机肥=2∶1∶1）共6种基质配比种植盆栽香菜,研究不同基质配比对盆栽香菜生长及品质的影响。结果表明,T4处理的盆栽香菜茎粗、根长和根体积等生长指标优于其他处理,全株鲜质量相对较大,为2.854 g,全株干质量具有最大值,为0.384 g。T4处理的品质指标可溶性蛋白含量、维生素C含量和叶绿素含量也相对较高,分别为37.78、0.20和2.02 mg/g。因此,建议使用草炭∶蛭石∶珍珠岩∶有机肥=2∶1∶1∶1的基质配比进行盆栽香菜的种植。   相似文献   

利用棉秆混合基质进行草莓栽培试验的研究     

章智钧  孙军利  张坤  时间  赵宝龙 《农业科技与装备》2016,(8)

以草莓为试材,利用草炭、棉花秸秆、菇渣、蛭石和细沙为原料,研究不同混配基质对草莓生长与结果的影响,以筛选出适合草莓无土栽培的基质配方。结果表明:处理T1(V草炭∶V棉花秸秆∶V蛭石=1∶1∶1)为最佳配比,其理化性质理想,栽培的草莓株高、茎粗及叶片叶绿素SPAD与对照CK(V草炭∶V蛭石=2∶1)无显著差异,而株产量优于对照。因此,腐熟后的棉花秸秆可代替部分草炭,处理T1(V草炭∶V棉花秸秆∶V蛭石=1∶1∶1)可作为草莓无土栽培基质使用。  相似文献   

以沼液为基质的小葱水培营养液配方研究     

谢琳玉  王铭愉  梁兰梅  张云红 《中国沼气》2023,(6):62-67

沼液富含植物生长所需的多种营养物质与活性物质，将沼液用于水培蔬菜，可以获得良好的经济效益与生态效益。较高的氨氮浓度以及不均衡的营养元素是制约沼液作为营养液用于水培植物的关键因素。针对该问题，以小葱为研究对象，探究了不同初始氨氮浓度与不同营养元素添加对小葱生长状况的影响，获得了以沼液为基质的小葱水培营养液配方。该配方为：氨氮浓度为850 mg·L^-1的沼液稀释5～6倍，添加磷酸二氢钾120 g·m^-3、氯化钾340 g·m^-3、七水硫酸镁150 g·m^-3、氯化钙180 g·m^-3、微肥0.1 mL·m^-3。此配方下以沼液为基质的小葱水培营养液中含氮150 g·m^-3、磷42 g·m^-3、钾310 g·m^-3、钙80 g·m^-3、镁50 g·m^-3、硫65 g·m^-3、铁4.5 g·m^-3、铜0.02 g·...  相似文献   

草莓残植基质化处理及其对生菜生长的影响分析     

《南方农机》2021,(10)

江苏句容地区草莓生产量大,草莓残植资源化利用不足。本文将草莓残植与菇渣、鸡粪等物质按不同体积比混合配制成6种不同的有机基质进行堆肥处理,探讨对生菜生长的影响。结果表明:草莓残植做有机基质培育的生菜,植株长势及品质都超过对照组,其中基质配比T_5.V(草莓残植)∶V(菇渣)∶V(鸡粪)=2∶1∶1的配比最优。  相似文献   

玉米秸秆复配基质对黄瓜幼苗生长发育的影响   总被引：2，自引：0，他引：2  

王宇欣  孙倩倩  王平智  赵亚楠  李雪嫄 《农业机械学报》2018,49(7):286-295

为探索玉米秸秆替代传统基质草炭的可行性,以"中农19号"黄瓜为供试材料,将玉米秸秆、草炭、沼渣、蛭石、珍珠岩等按不同体积比混配制成育苗基质。通过电镜扫描和能谱分析对玉米秸秆和草炭的形貌特征及元素组成进行分析比较,并进行穴盘育苗试验,研究玉米秸秆对基质理化性质和黄瓜幼苗生长的影响。结果表明:添加玉米秸秆对基质的容重、总孔隙度、有机质含量、p H值和电导率EC等理化性质有改善作用;将玉米秸秆按照适宜的体积配比代替草炭和沼渣育苗时,对黄瓜幼苗的生长发育有促进作用。试验表明,与对照组CK1(草炭25%、沼渣25%、珍珠岩25%、蛭石25%)相比,T1(秸秆10%、草炭20%、沼渣20%、珍珠岩25%、蛭石25%)和T2(秸秆20%、草炭15%、沼渣15%、珍珠岩25%、蛭石25%)更适宜作物生长,种子萌发40 d时,T1组黄瓜幼苗的株高为(8.61±0.34)cm、茎粗为(4.34±0.27)mm、叶绿素相对含量为(37.40±2.15)SPAD、叶面积为(60.21±1.69)cm~2、根系活力为(118.306±30.611)TTFμg/(g·h),均显著高于对照组CK1。因此,玉米秸秆对黄瓜幼苗的生长具有一定的促进作用,可代替部分草炭用于育苗基质的配制。  相似文献   

蚯蚓堆肥处理有机废弃物的研究——基于红薯秸秆、牛粪和污泥的混合物料   总被引：1，自引：0，他引：1  

张婷敏  呼世斌  陈晓飞 《农机化研究》2012,(4):110-114

为了探明蚯蚓堆肥处理红薯秸秆、牛粪和污泥混合物料的最佳配比,在实验室条件下进行了模拟培养实验。实验共设不同配比混合物料5个处理,研究了处理前后物料的理化性质变化,从处理后物料速效养分的含量来确定蚯蚓处理混合物料的最佳配比。结果表明:经蚯蚓堆肥处理后,各种配比物料的pH值、有机质和全氮(处理1与处理2除外)含量均下降,EC值、速效氮、全磷、速效磷、全钾及速效钾含量均升高;总体上,10%红薯秸秆+60%牛粪+30%污泥的处理速效氮、速效磷和速效钾含量最高。因此,蚯蚓堆肥处理红薯秸秆、牛粪和污泥混合物的最佳配比是10%红薯秸秆+60%牛粪+30%污泥,此配比的混合物料经蚯蚓处理后可以得到高品质的有机肥。  相似文献   

尾菜沼液对基质栽培生菜产量和品质的影响     

《中国沼气》2020,(3)

文章以有机肥为对照(CON),设置4个沼液(BS)施用量,研究尾菜沼液对基质栽培生菜产量和品质的影响。结果表明:3个沼液处理(BS2,BS3和BS4)相比CON增加了生菜产量,分别增加了11.4%,37.9%和35.5%。相对于有机肥,施用沼液能提高生菜的VC含量,降低硝酸盐含量,其中BS2的效果最好。与有机肥处理相比,施用沼液的处理促进了生菜对养分的吸收。综上,适量尾菜沼液可以代替商品有机肥生产基质生菜。  相似文献   

不同离子微咸水对土壤水力特性和生菜生长的影响     

乔若楠  程煜  闫思慧  罗敏  王春  张通港  张体彬 《排灌机械工程学报》2023,41(3):288-295

为探究不同微咸水水质对土壤水力特性和作物生长的影响,在日光温室条件下,以生菜为供试作物开展2季盆栽试验.以CaSO₄的饱和溶液为对照(CK),向去离子水中添加不同氯化盐形成电导率相同而阳离子组成不同的微咸水处理(分别为Na⁺∶T_Na;Na⁺/K⁺比为1∶1:T_Na-K;K⁺∶T_K),研究连续灌溉下土壤容重、持水性能、水盐运移,以及生菜生长响应,并采用van Genuchten模型对水分特征曲线相关参数进行拟合分析.结果表明:与CK相比,微咸水灌溉均增加了土壤容重,降低了土壤孔隙度;随着微咸水持续灌溉,土壤孔隙分布明显改变,微小孔隙比例增加,土壤持水能力显著提高,以处理T_Na最为显著.连续微咸水灌溉下,灌溉水钠吸附比、土壤结构稳定性阳离子比与土壤进气值参数存在负相关关系(R²均为0.78).土壤中盐分逐渐积累,表现为第2季生菜生长季末(播后80 d)各处理0~20 cm土壤饱和提取液电导率较第1季显著升高,其中CK显著低于其他处理(P<0.05),且表层土壤(0~10 cm)中盐分积累更为明显.生长季末土壤表层含水量较高,与盐分分布基本一致.与CK相比,处理T_Na,T_Na-K和T_K显著降低了生菜生物量的积累(P<0.05),其中T_Na最低.  相似文献   

3种典型有机废弃物厌氧消化中NH₃和CS₂的释放特征     

黄春艳  田光亮  汪国英  席劲瑛  何腾兵 《中国沼气》2022,(2):18-26

为探究典型有机废弃物中NH₃、CS₂的释放特征,将鸡粪、果蔬废弃物、餐厨垃圾进行序批式厌氧消化。结果显示NH₃在沼气中的平均浓度：餐厨垃圾(9.4±6.6 mg·m^-3)>鸡粪(7.2±3.7 mg·m^-3)>果蔬废弃物(4.9±3.9 mg·m^-3);原料NH₃生产潜力：餐厨垃圾(6.5 g·t^-1)>鸡粪(3.8 g·t^-1)>果蔬废弃物(2.0 g·t^-1)。CS₂在沼气中的平均浓度：餐厨垃圾(0.05±0.03 mg·m^-3)>果蔬废弃物(0.04±0.03 mg·m^-3)>鸡粪(0.02±0.01 mg·m^-3);原料CS₂生产潜力：餐厨垃圾(0.04 g·t^-1)>果蔬废弃物(0.02 ...  相似文献   

沼液灌溉对芥菜产量及养分吸收的影响研究     

《中国沼气》2017,(5)

通过箱体栽培试验研究沼液施用量对芥菜产量及养分吸收的影响、比较沼液处理与化肥处理,得出芥菜最适合沼液量,为"猪-沼-菜"生态循环农业模式推进提供依据。试验表明,每次施用1.5 L沼液最为合理:芥菜地上部分生物量最高624 g,相比空白处理增产831%,相比化肥处理增产54.4%;体内硝态氮190 mg·kg~(-1)仅占化肥处理的54.0%,含量远低于化肥处理;总养分含量可达8.66 mg·kg~(-1),是空白处理的5.47倍,化肥处理的1.49倍,其中全氮、全磷、全钾含量相比空白处理分别提高368%,427%,477%。适量沼液灌溉,可有效促进芥菜生长,提高芥菜产量及其对养分的吸收能力,降低硝酸盐含量。  相似文献   

Possible utilization of high-salinity waters and application of low amounts of water for production of the halophyte Kochia scoparia as alternative fodder in saline agroecosystems     

Mohammad Kafi  Hajar Asadi  Ali Ganjeali 《Agricultural Water Management》2010,97(1):139-147

Production of halophytes using saline waters and soils and feeding them to livestock is one of the most sustainable methods of conservation in desert ecosystems, in addition to accomplishing food production for the people living in these areas. Therefore, to study the possibility of irrigating Kochia (Kochia scoparia L. Schrad) with minimum quantities of highly saline water for use as a fodder crop in arid environments stretching across saline waters, two experiments were carried out in the Research Farm of the Ferdowsi University of Mashhad, Iran. In the salinity experiments, two populations of Kochia, including the Sabzevar and Indian genotypes, were irrigated with ground water having electrical conductivity (EC) of 5, 15, and 20 dS m⁻¹. In the irrigation-treatment experiments, two local populations of Kochia, including Sabzevar and Borujerd, were subjected to four irrigation regimes as follows: complete irrigation (100%), 80%, 60%, and 40% of the water requirements using a saline ground water with EC = 5 dS m⁻¹. Because, the Indian genotype is preferred as an ornamental plant, it is not suitable for increased dry-matter production under high-salinity irrigation water compared to the local genotype (Sabzevar), which is suitable for forage. The Sabzevar genotype produced a large amount of dry matter (7530 kg ha⁻¹), even when irrigated with 20 dS m⁻¹ saline water. The best time for harvesting Kochia for fresh feeding is at the end of flowering (88 days after sowing or DAS), when the biomass is relatively high (6500 kg ha⁻¹) and the leaf-to-shoot ratio, as a quality index, is approximately 50%. The highest green-area index was observed at 15 dS m⁻¹ and decreased at high levels of salinity. Photosynthesis and transpiration rate did not decline significantly with increasing external salinity four weeks after salinization, but increased in both genotypes at 15 dS m⁻¹, indicating that the salinity-tolerance threshold of Kochia for both photosynthesis and transpiration reduction is above this salinity level. The Indian genotype also showed a very low seed yield (210 kg ha⁻¹) at low levels of salinity, whereas Sabzevar produced 1120 kg ha⁻¹ seed under the same conditions. Different irrigation regimes had a significant effect on the biomass and seed production of Kochia. The highest forage yield was obtained from complete irrigation, with 11.1 Mg ha⁻¹ dry material. Sabzevar local population represented a better performance in terms of all characteristics, except accumulation of inflorescence dry matter, and no significant effects were recorded. In conclusion, Kochia's high foliage production capacity in the presence of salinity and limited irrigation make this plant suitable for use as an alternative forage crop in harsh environmental conditions. There is a wide range of intraspecific variation in K. scoparia, but more investigation is needed to introduce it as a cash crop.  相似文献   

Comparison and sensitivity of measurement techniques for spatial distribution of soil salinity     

A. Akramkhanov  R. Sommer  C. Martius  J. M. H. Hendrickx  P. L. G. Vlek 《Irrigation and Drainage Systems》2008,22(1):115-126

In Khorezm, a district of Uzbekistan situated in the Aral Sea Basin, soil salinization is an important driver of soil degradation in irrigated agriculture. The main objective of this study was to identify techniques that enable rapid estimation of soil salinity. Therefore, bulk electrical conductivity of the soil (EC_a-meas) was measured with three different devices (2P, 4P, and CM-138) and electrical conductivity of the soil paste (EC_p-meas) was measured with the so-called 2XP device. These measurements were compared with independent estimates of EC_a-calc and EC_p-calc based on laboratory measurements of the saturated extract, EC_e, of soil samples from the same sites. Soil salinity could be assessed satisfactorily with all four devices. EC_p-meas could be well reproduced by the 2XP device (R ² = 0.76), whereas EC_a-meas estimates using 2P, 4P, and CM-138 in the field were less accurate (R ² < 0.50). The sensitivity of all devices to the main ions Cl⁻ and Ca^{2 +} suggests that the measuring principles are similar for all instruments. The devices can therefore be used interchangeably. Field assessment of soil salinity was considerably enhanced by the use of CM-138, because large areas can be quickly assessed, which may be desirable in spite of the lower accuracy.  相似文献   

Evaluation of a crop water stress index for irrigation scheduling of bermudagrass   总被引：1，自引：0，他引：1  

Yasar Emekli  Ruhi Bastug  Dursun Buyuktas  Nefise Yasemin Emekli 《Agricultural Water Management》2007,90(3):205-212

This study was conducted to assess crop water stress index (CWSI) of bermudagrass used widely on the recreational sites of the Mediterranean Region and to study the possibilities of utilization of infrared thermometry to schedule irrigation of bermudagrass. Four different irrigation treatments were examined: 100% (I₁), 75% (I₂), 50% (I₃), and 25% (I₄) of the evaporation measured in a Class A pan. In addition, a non-irrigated treatment was set up to determine CWSI values. The status of soil water content and pressure was monitored using a neutron probe and tensiometers. Meanwhile the canopy temperature of bermudagrass was measured with the infrared thermometry. The empirical method was used to compute the CWSI values. In this study, the visual quality of bermudagrass was monitored seasonally using a color scale. The best visual quality was obtained from I₁ and I₂ treatments. Average seasonal CWSI values were determined as 0.086, 0.102, 0.165, and 0.394 for I₁, I₂, I₃, and I₄ irrigation treatments, respectively, and 0.899 for non-irrigated plot. An empirical non-linear equation, Qave=1+⌊6[1+(4.853 CWSIave)^2.27]^−0.559⌋$Q_{\text{ave}}=1+⌊6{[1+{(4.853\text{CWS}{\text{I}}_{\text{ave}})}^{2.27}]}^{-0.559}⌋$, was deduced by fitting to measured data to find a relation between quality and average seasonal CWSI values. It was concluded that the CWSI could be used as a criterion for irrigation timing of bermudagrass. An acceptable color quality could be sustained seasonally if the CWSI value can be kept about 0.10.  相似文献   

Evaluation of the utilization of heated sewage sludge for peri-urban horticulture production in the Sahel of West Africa     

Keiichi Hayashi  Tahirou Abdoulaye  Toshiyuki Wakatsuki 《Agricultural Systems》2010,103(1):36-40

Shortage of organic matter hinders agricultural production in the Sahel, and this lack of enough organic matter is more severe for peri-urban horticulture, which depends heavily on it. Alternative sources of organic matter that offer new options for peri-urban horticulture can help reduce the potential for conflict over finite resources between traditional crop production and peri-urban horticulture. Both agronomic and economic evaluations of an organic amendment called heated sewage sludge (HSS) were conducted in the research station of International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)-Niamey, Niger, West Africa. For this study, HSS, a material imported from Japan, applied at a dosage application equivalent to 20.0 kg 100 m⁻² on lettuce fields led to production levels as high as those of conventional methods, and the yield became even higher than those of conventional methods when the dosage was increased to 50.0 kg 100 m⁻² and 100.0 kg 100 m⁻². Even though HSS was imported, its benefits outweighed its cost, as evidenced by the positive net returns. Since profitability in peri-urban horticulture is much higher than that of traditional crop production, the results of this study imply that if adopted, the use of HSS can lead to increased availability of organic matter for traditional cropping systems.  相似文献   

Regulation of irrigation canals     

Pierre-Olivier Malaterre 《Irrigation and Drainage Systems》1995,9(4):297-327

This article suggests and defines a characterisation of irrigation canal regulation methods, based on four criteria: considered variables (controlled, measured, and control action variables), logic of control, design method (structure and technique) and field implementation (configuration and device). Depending on the chosen criterion and partition rule, different classifications can be built from this characterisation. In conclusion, a structured characterisation table of the main published canal regulation methods is presented.Abbreviations ASCE American Society of Civil Engineers - CACG Compagnie d'Aménagement des Coteaux de Gascogne - CARA Compagnie d'Aménagement Rural d'Aquitaine - CARDD Canal Automation for Rapid Demand Deliveries - CEMAGREF Centre National du Machinisme Agricole, du Génie Rural, des Eaux et des Forêts - CNABRL Compagnie Nationale d'Aménagement du Bas — Rhône Languedoc - ELFLO Electronic Filter and Level Offset - FB Feedback or closed — loop control - FB _dn Feedback or closed-loop downstream control - FB _mi Feedback or closed-loop mixed control - FB _up Feedback or closed-loop upstream control - FF Feedforward or open-loop control - GPC Generalised Predictive Control - LQR Linear Quadratic Regulator - MIMO Multiple Inputs, Multiple Outputs - nI mO n Inputs, m Outputs - P Perturbation - P Estimation of perturbations - PID Proportional, Integral, Derivative Controller - PIR Contrôleur Proportionnel, Intégral, Retard (PI Delay controller) - Q Discharge in the canal - Q _dn Downstream discharge in the canal - Q _in Intermediate discharge in the canal - Q _up Upstream discharge in the canal - SCP Société du Canal de Provence - SISO Single Input, Single Output - U Control action variable - V Volume in a canal pool - V Elementary control action variable - w Regulator gate opening - Y Controlled variable - Y _c Target controlled variable - y Water elevation - y _dn Downstream water elevation of the pool (therefore upstream of a regulator) - y _in Intermediate water elevation in the pool - y _up Upstream water elevation of the pool (therefore downstream of a regulator) - Z Measured variable  相似文献   

移栽期对毕纳1号烟草气候斑病发生及生长的影响     

张丽娟  陈春旭  王秋萍  龙友华  代园凤  蒋承耿 《农业科技与装备》2019,(2):21-24

为探明毕纳1号烟草最适移栽期,研究移栽期对烟草气候斑病的发生和生长的影响。结果表明:适宜的移栽期有利于减轻毕纳1号烟草气候斑病的发生,可改善毕纳1号烟草农艺性状、提高烟叶叶绿素含量,并在一定程度上间接提高烟株抗病性;其中4月27日移栽综合表现最佳,移栽后60 d发病率和病情指数分别为20.10%和2.67,较其他2个移栽期分别显著(P<0.05)降低9.66%～12.12%和1.30～1.61。该结果为毕纳1号烟草适时移栽和气候斑病综合防控提供了技术参考。  相似文献   

Effect of irrigation uniformity on the profitability of crops     

E. López-Mata 《Agricultural Water Management》2010,98(1):190-198

There are numerous models capable of simulating crop behavior under different water stress conditions. However, none of them takes into account the effect of irrigation water uniformity on yield. The model developed simulates the uniformity effect on yield and the repercussion on gross margin (GM). The application of the model to a maize crop in Albacete (Spain) indicates that for the same irrigation depth, an increase in uniformity of water in the soil (CU) corresponds to a 4% increase in yield for the common irrigation strategy in the area, and a 6.8% increase in yield for the optimal irrigation schedule established by the model. Values of percentage of adequately irrigated area (a) between 50 and 80% appear to be adequate for values of CU > 80%. This effect has special relevance on the GM mainly when designing the irrigation strategy of areas with limited water resources. This leads to improvement of CU from 75 to 95% for the common irrigation depth applied to maize and may increase GM up to 27%. For small irrigation depths, the effect of CU on GM is reduced. The maximum GM is reached at ET_a/ET_m < 1 and a <100%. The paper also describes a methodology for determining the most suitable irrigation schedule under regulated deficit irrigation conditions.  相似文献   

Sensitivity analysis and field testing of the RISK-N model in the Central Valley of Chile     

Ricardo Oyarzun  Jose Arumí  Luis Salgado  Miguel Mariño 《Agricultural Water Management》2007

We present the results from a sensitivity analysis and a preliminary short-term, site-scale performance assessment of the analytical soil and groundwater nitrate transport RISK-N. The study was carried out in the Central Valley of Chile, on a 2.6 ha corn (Zea mays L.) field underlain by a shallow unconfined aquifer during the cropping season 2000–2001. Nitrogen levels in soils as well as NO₃⁻–N irrigation water and groundwater concentrations were monitored through the crop-growing period, the latter by a network of 16 monitoring wells. A sensitivity analysis shows that both the nitrate flux from the vadose zone and NO₃⁻–N groundwater concentration are mainly influenced by the initial soil nitrogen levels, water input, and soil porosity. Also, simulated groundwater NO₃⁻–N levels are sensitive to changes on the saturated zone denitrification constant. An additional analysis further reveals the significance of the latter parameter, in conjunction with the amount of applied nitrogen fertilizer. We obtained a good agreement between observed average and simulated values. While the model performs well when spatially averaged values are used (root mean square error, RMSE = 1.4 mg l⁻¹ of NO₃⁻–N), the prediction error increases (RMSE = 1.9 mg l⁻¹ of NO₃⁻–N) when the concentration in each well is considered. This fact could be explained by the time and space scale of the experiment and the characteristics of the RISK-N model. The model is easy to use and seems appropriate for mid- and long-term studies of nitrogen contamination in groundwater for agricultural conditions in the Central Valley of Chile and under limited field data availability conditions. However, it needs to be tested for longer periods and under different climatic conditions, soil types, and aquifer characteristics, before its range of applicability can be fully established and recognized.  相似文献   

烟草破膜自动定位方法及比较     

刘天琪  李浙昆  李俊  郑新虎  李文标  张皓天  胡小东 《农业装备与车辆工程》2019,(4):27-29

对烟苗种植过程中需要人工破膜提出了机械自动化破膜,为实现机械自动化破膜提出3种自动定位烟苗方法,利用双立目视觉机器采取信息图像进行定位破膜;采用3D激光扫描对烟苗进行信息采集定位以及利用精准农业这套整体测控系统全方面定位对这三种方法进行了阐述,并在实际烟草种植破膜过程中对3种方法的优缺点进行比较。  相似文献   

Application of drag reducing commercial and purified guargum for reduction of energy requirement of sprinkler irrigation and percolation rate of the soil     

《Agricultural Water Management》2001,47(2):101-118

Drag reducing polymers reduce the drag in a turbulent flow while increase the drag in a laminar flow, due to an increase in shear viscosity. This feature of drag-reducing polymers has been utilised in reducing the energy requirements of sprinkler irrigation system and increasing the area of coverage as well as reducing the percolation loss of water added with drag reducing polymers. Two types of polymers at various concentrations were studied at the Indian Institute of Technology, Kharagpur. Two different methods of injection of polymers were also tested to determine the effect of polymer on mode of injection. The concentrations of 100, 250, 300 and 450 ppm of commercial guargum and 50, 100 and 150 ppm of purified guargum were used for homogenous injection (T₁). The concentrations of 100, 300, 600, 1000 and 1500 ppm of commercial guargum and 50, 100, 200, 350 and 500 ppm of purified guargum were used for injection at the suction side of the pump(T₂). The infiltration characteristics of the soil with polymer added water was tested for 300, 1000 ppm of commercial guargum and 100, 500 ppm of purified guargum. For T₁, the maximum power reduction of 28% was obtained in case of 300 ppm commercial guargum and approximately the same percentage was obtained in case of 100 ppm purified guargum. The maximum drag reduction was 35.5% at 300 ppm of commercial guargum and 38% at 100 ppm of purified guargum. The maximum increase in the radius of coverage at 500 ppm commercial guargum was estimated to be 33 and 37% at 150 ppm of purified guargum. For T₂, the maximum power reduction at 1000 ppm of commercial guargum and at 500 ppm of purified guargum was 31.25%. The maximum increase in radius of coverage at 1000 ppm of commercial guargum and at 500 ppm of purified guargum was 37 and 38.2%, respectively. The maximum drag reduction of 40% was obtained at both 1000 ppm of commercial guargum and 500 ppm of purified guargum. The reduction in the infiltration rate at 1000 and 300 ppm of commercial guargum was found to be 56.52 and 27%, respectively, whereas the reduction in the infiltration rate at 100 and 500 ppm purified guargum is 15 and 22.8%, respectively. The study reveals great potential of using drag reducing polymers for irrigation water management.  相似文献