共查询到19条相似文献，搜索用时 234 毫秒
1.
2.
不同辣木种质资源叶片营养元素含量分析 总被引：2，自引：0，他引：2
对引进的32份辣木种质资源叶片的N、P、K、Ca等营养元素的含量进行测定分析。结果表明:辣木叶片中N元素含量最高,其含量在3 600.53~5 093.73 mg/hg之间,其次是K元素含量,其含量在583.01~1 034.83 mg/hg之间。辣木种质资源成熟叶粉营养元素含量总体呈现N>K>P>Mg>Ca>Mn>Zn>Fe>Cu的趋势。相关分析结果显示,Fe元素含量与N元素含量之间呈极显著正相关,相关系数达0.526,此外,Fe元素含量与除了P元素之外的其他元素含量均显著相关,而P元素含量与其他任何元素含量之间的相关性均不显著。聚类分析结果显示,利用N元素含量的差异,32份辣木种质资源被分成来自于非洲的A类群和来自于亚洲国家或地区的B类群。 相似文献
3.
2006年在海南垦区抽取765份代表性橡胶树叶片样品，对胶树营养状况进行全面调查。结果表明，几个主要土壤类型区林段叶片氮含量没有达到旧诊断指标的正常值范围，高产量段N/P、N/K、K/P与旧诊断指标比值的正常水平吻合。在海南农垦原橡胶专用肥使用的基础上，提出了不同类型土壤上橡胶树N、P、K配比的建议。 相似文献
4.
以6龄腰果无性系FL30为对象,采集全年12个月腰果成熟叶片样品,分析腰果叶片N、P、K年周期变化规律;并采集腰果衰老叶片样品,分析腰果树N、P、K再吸收效率.结果表明:腰果叶片N、P、K含量随生育期的改变而变化;叶片N含量从抽梢期至果实成熟呈上升趋势,果实成熟后明显下降,休眠期叶片N含量变化不大;叶片P含量从抽梢期至初果期总体呈下降趋势,初果期至休眠期则呈上升趋势；叶片N/P呈现出与N相似的年周期变化规律;叶片K含量在抽梢期呈下降趋势,初花期骤然上升,盛花坐果期继续缓慢上升,果实生长期至休眠期则呈下降趋势;腰果成熟叶片N、P、K含量显著高于衰老叶片,N、P、K再吸收率较高,再吸收效率顺序为REp＞REN＞REk. 相似文献
5.
《福建热作科技》1986,(3)
本文调查了温度对香蕉第三最幼叶片、第三最幼叶片中脉和第七最幼叶片叶柄的干物质中N、P、K、Ca、Mg、Na、Mn、Cu、Zn和Cl的含量影响.香蕉品种为wiliams,种植于利用太阳光照、环境条件控制的、室内昼/夜温度为17/10、21/14、25/18、29/22、33/26或37/30℃的盆栽房里,时间为12周.温度对大多数组织中的所有养份的含量影响显著(P=0.05).在一定温度范围内,某些养分含量保持稳定.例如,在第三叶片中,在17～37℃温度范围内,N的含量稳定;在21～29℃温度范围内,K的含量稳定.样品的养分含量与整个植株的养分含量的比值随温度的变化而变化.这个比值用来确定是否该样品能反映整个植株的养分状况.比值变化的大小取决于元素本身.对于元素Zn,比值变化最小;对于元素Ca、MG和Mn,比值变化大(2～3倍):对于元素N、P、K、Na、Cu和Cl,则比值变化介于中间状态.试验表明,对生长在不同气候条件下香蕉叶片分析数据的解释时,必须加倍小心,尤其对于元素Ca Mg和Mn 可靠的诊断可在日温度为17～30℃之间获得. 相似文献
6.
7.
氮、磷、钾、钙肥不同用量对花生光合性能及产量品质的影响 总被引：19，自引：1，他引：18
在田间试验条件下研究了N、P、K、Ca肥不同用量对花生光合性能及产量品质的影响,结果表明,施N、P、K、Ca肥可提高花生叶片叶绿素含量和光合速率;对叶片光合性能的改善作用,N肥主要在前期、P肥在中后期、K肥和Ca肥前后期比较一致。施肥可明显提高花生荚果产量,且施N肥处理随施肥量的增加产量显著提高,施P、K、Ca肥处理以中等施肥量(P150、K300、Ca300)产量最高。施肥可不同程度地提高花生籽仁脂肪、粗蛋白和游离氨基酸含量,改善花生籽仁品质。对花生籽仁品质的改善作用,P肥最大,其次是N和Ca肥,K肥的作用不明显,施K肥过多(K450)还会明显降低脂肪含量。施用Ca肥能提高花生籽仁中油酸亚油酸比值(O/L),K肥可提高花生籽仁可溶性糖含量。 相似文献
8.
9.
以威廉斯8818香蕉为试材,采用整株挖掘、分解取样的方法,研究其干物质的构成特点、各器官矿质元素含量和累积及分布特征。结果表明,香蕉植株果实膨大期总干物质量为5.4 kg/株,其中叶片占36.1%,假茎占34.3%,球茎占15.1%,果实占10.6%,根占2.9%,果轴占1.1%。每株累积吸收N 61.65 g、P 4.40 g、K 49.65 g,N、P、K的吸收比例为1∶0.07∶0.81。此时期,N、P、K分配率规律为叶片＞假茎＞果实,果轴中则最低。叶片中N含量最高,其次为果实和果轴,假茎(叶鞘)最低。P以果实含量最高,叶片次之,球茎最低。K以果实含量最高,根次之,假茎(叶鞘)和球茎最低。叶片、假茎(叶鞘)、真茎(地上茎)和球茎中各矿质元素含量的大小顺序为N＞K＞P,而果实、果轴和根中则为K＞N＞P。 相似文献
10.
油棕不同叶序五种营养元素含量的测定及变化规律研究 总被引：1，自引：0，他引：1
本文首次根据油棕叶片在树冠轮生的规律,对不同成熟度的叶片进行排序,进而对不同叶序的N、P、K、Ca、Na五种营养元素含量进行了测定,并对其变化规律作了分析与研究,结果表明：(1)不同油棕树体五种营养元素含量有所差异;（2）从整体看,第8至26叶,Ca含量上升,Na含量略微上升,而K含量则下降, N和P则没有一定的规律性;（3）成龄树K含量变化范围为0.41%～1.08%;Ca含量变化范围为0.47%～1.03%;Na含量变化范围为0.011%～0.052%;N含量变化范围为1.83%～2.30%;P含量变化范围为0.12%～0.19%。（4）本试验中第20～22叶营养元素含量变化幅度小,比较稳定,可为我国油棕营养诊断取样提供较为科学的参考,与马来西亚第17叶采样标准有所差异。 相似文献
11.
《Plant Production Science》2013,16(4):360-366
We examined biomass dry matter and nutrient uptake of live plant parts, leaf area index, and litter of winged bean (Psophocarpus tetragonolobus) and velvet bean (Mucuna pruriens) 12, 18, 24 and 30 weeks after sowing (WAS). The two plants had similar leaf and stem+petiole biomasses. At 30 WAS winged bean had a significantly lower pod yield than velvet bean. Between 18 and 30 WAS, winged bean produced less litter than velvet bean due to differences in growth stages. The total mulch of live parts and litter of winged bean and velvet bean completely covered the ground by 18 and 12 WAS, respectively. Compared to velvet bean, the leaf and stem+petiole of winged bean had a significantly higher N concentration; significantly higher N uptake at 24 and 30 WAS; significantly lower C/N ratio; and significantly higher P, K and Mg concentrations. In winged bean, P uptake was significantly higher in the leaf at 30 WAS and in the stem+petiole at all harvesting times. The total biomass of the leaf, stem+petiole and litter of winged bean was 317–561 g DM m-2, and their N content was 12.3–17.7 g m-2. The total biomass of live parts and litter of winged bean might be sufficient to suppress weeds and increase soil N. Winged bean is an appropriate legume cover crop and green manure due to its longer growing period and superior ground-covering ability and high N input. 相似文献
12.
13.
B. V. Mnembuka B. O. Eggum 《Plant foods for human nutrition (Dordrecht, Netherlands)》1995,47(4):333-339
Chemical analyses and feeding experiments using rats were conducted to evaluate the nutritive value of winged bean and other legumes (soyabean, green gram, bambarra nuts, pigeon peas, field beans, cow peas) sources grown in Tanzania. Proximate analyses showed that the composition of winged bean was similar to soyabean, while the composition of the other legumes differed considerably. This was also the case for antinutritional constituents and minerals. As to the amino acid composition, the lysine level was high with the highest value in winged bean (7.5 g/16 g N). However, the concentration of methionine and cystine was low which limits their protein quality. Another important amino acid, threonine, was generally high, especially in winged bean (4.3 g/16 g N). With exception of field bean, true protein digestibility was above 80%, soyabean having the highest value (90.7%). The biological value was also highest in soyabean (76.1%) followed by winged bean (69.9%). Utilizable protein was high in soyabean (28.8%) and somewhat lower in winged bean (23.4%). Energy digestibility was around 80%, soyabean having the highest value of 85.8%. The study findings support the idea that winged bean is a good alternative plant protein source in Tanzania. 相似文献
14.
Patrush Lepcha Ashley N. Egan Jeff J. Doyle N. Sathyanarayana 《Plant foods for human nutrition (Dordrecht, Netherlands)》2017,72(3):225-235
Winged bean, Psophocarpus tetragonolobus (L.) DC., is analogous to soybean in yield and nutritional quality, proving a valuable alternative to soybean in tropical regions of the world. The presence of anti-nutritional factors and high costs associated with indeterminate plant habit have been major concerns in this crop. But occurrence of good genetic variability in germplasm collections offers precious resources for winged bean breeding. However, lack of germplasm characterization is hindering such efforts. From a genomic standpoint, winged bean has been little studied despite rapid advancement in legume genomics in the last decade. Exploiting modern genomics/breeding approaches for genetic resource characterization and the breeding of early maturing, high yielding, determinate varieties which are disease resistant and free of anti-nutritional factors along with developing consumer friendly value-added products of local significance are great challenges and opportunities in the future that would boost cultivation of winged bean in the tropics. We review past efforts and future prospects towards winged bean improvement. 相似文献
15.
为探讨减施化肥条件下,间作绿肥压青还田对甘蔗生长的影响及化肥的替代作用。试验设计了6个处理,处理1（CK）：甘蔗常规施肥;处理2（H-LY）：化肥减施25%+12%营养元素当量绿豆绿肥还田+13%营养元素当量有机肥;处理3（H-LQ）：化肥减施25%+全量绿豆绿肥还田;处理4（H-Y）：化肥减施25%+25%营养元素当量有机肥;处理5（H-HD）：化肥减施25%+25%营养元素当量黑豆绿肥还田;处理6（H-HQ）：化肥减施25%+全量黑豆绿肥还田。研究结果表明,间作绿豆绿肥和黑豆绿肥在生育前期甘蔗的分蘖和甘蔗总苗数都较常规处理降低,间作黑豆还降低了甘蔗的叶片宽度。甘蔗化肥减施25%条件下,间作绿豆绿肥全量还田、12%营养元素当量间作绿豆绿肥还田+13%营养元素当量有机肥替代的蔗茎产量和经济效益均达到常规对照水平。但间作黑豆压青还田导致甘蔗减产,降低经济效益。兼顾甘蔗产量、经济效益、资源消耗及蔗地的地力提升各方面,甘蔗间作绿豆绿肥全量还田可以替代25%的甘蔗化肥,是值得推广的一种模式。 相似文献
16.
《Field Crops Research》2005,91(1):91-105
A velvet bean (Mucuna pruriens L.) module for the agricultural production systems simulator (APSIM) was developed in order to assess the nitrogen (N) and yield benefits of velvet bean green manure crops, when grown in rotation with maize in small holder situations in Malawi. The velvet bean module was able to simulate maturity biomass from six contrasting sites in Malawi over an observed range of 847–10,420 kg/ha with a root mean squared deviation (RMSD) of 1562 kg/ha. APSIM was then tested for its ability to simulate the response of maize crops to fertiliser N in two seasons, to previous velvet bean green manure crops in one season, or both in combination in one season. With no previous velvet bean crop, the response to fertiliser N varied across sites from a non-significant increase to an eight-fold increase in maize yield. Where a velvet bean crop was grown in the previous season, the response to applied N varied from non-significant to slight. Simulated yields were within one standard error of the observed in the majority of cases. A sensitivity analysis for key parameters in the velvet bean module highlighted, that those governing the N content of crop root and shoot residues had greatest impact on maize yield response. Parameters controlling production and partitioning of root or shoot biomass were less important.To our knowledge this is the first reported case of a cropping systems simulation model being tested for its ability to simulate the production of a green manure legume followed by a cereal. 相似文献
17.
18.
长期绿肥还田对江南稻田系统生产力及抗逆性的影响 总被引：2，自引：0，他引：2
依据江南丘陵地区双季稻田28年（1981-2008年）长期绿肥还田的田间定位试验和4年的养分耗竭盆栽试验,分析比较了长期不同量绿肥还田对稻田系统生产力和抗逆性的综合影响。结果表明,常量绿肥还田和高量绿肥还田处理下,早稻、晚稻和历年的全年平均籽粒产量和生物学产量及其变异系数与长期单施化肥处理差异不显著,但由于绿肥还田处理施用绿肥替代部分化肥,平均每年的化肥N、P和K投入量比单施化肥处理分别减少90.0、9.9和72.0 kg/hm2。绿肥处理的双季稻全年产量呈上升趋势,而长期化肥处理则呈下降趋势,且前者的全年产量可持续性产量指数均略高于后者,常量绿肥还田下稻田系统的耐瘠能力也显著高于长期单施化肥处理。不同量绿肥还田下稻田系统生产力差异不显著,但耐瘠能力常量还田处理较高。 相似文献
19.
对青饲玉米施用不同的肥料品种和用量作基肥,对产量有明显的影响：有机肥作基肥,肥效期长,但玉米吸收慢,满足不了玉米快速生长的需求;纯化肥N、P、K搭配作基肥,玉米生长快,产量高,但到后期有脱肥现象;以化肥N、P、K搭配一定量的农家肥作基肥最好。 相似文献