共查询到19条相似文献，搜索用时 93 毫秒
1.
为探究冬小麦科学施肥技术,明确养分专家系统推荐施肥对冬小麦产量、养分积累转运与利用的影响,于2018—2019年分别在河南省鹤壁市和新乡市以冬小麦(鹤壁、新乡试验品种分别为‘郑麦7698’和‘郑麦366’)为试验材料,设置7个处理[农民习惯施肥(FP)、当地推荐施肥(ST)、养分专家系统推荐施肥(NE)、在NE基础上配施缓控释氮肥(RNE)、在NE基础上不施氮肥(NE-N)、在NE基础上不施磷肥(NE-P)、在NE基础上不施钾肥(NE-K)],探究不同施肥处理对冬小麦氮、磷、钾养分转运分配规律和肥料利用效率的影响。结果表明,冬小麦氮、磷、钾施肥量NE较FP处理分别降低16.2%、43.3%、-13.2%(鹤壁)和19.5%、48.0%、-57.9%(新乡);冬小麦产量NE与FP处理无显著性差异,RNE与FP处理存在显著性差异;NE、RNE较FP处理分别增产4.7%～6.6%、5.5%～9.6%(P0.05)。进一步研究表明,NE、RNE处理可显著增加地上部植株养分含量和积累量(P0.05),其花后干物质积累量较FP处理增加9.2%～14.0%、11.9%～18.6%;花前氮、磷素转运量和钾素转运对籽粒钾素积累贡献率均有提高,基于养分专家系统推荐施肥的氮、磷、钾肥平均利用效率分别为42.1%、19.2%、46.6%,平均农学效率分别为11.5kg·kg~(-1)、13.2 kg·kg~(-1)、13.3 kg·kg~(-1)。综上可知,小麦养分专家系统指导优化了氮、磷、钾肥的施用量和施用方法,促进了小麦对氮、磷、钾养分的吸收利用,提高了肥料利用率,具有良好的增产效果,可以在河南地区推广应用。 相似文献
2.
为验证棉花养分专家系统推荐施肥在新疆南北疆区的适用性,研究了养分专家推荐施肥对棉花产量、经济效益、养分吸收和肥料利用率的影响。2020年,在新疆沙湾、昌吉和巴楚开展田间试验,每个试验设6个处理：基于养分专家系统的推荐施肥（NE）;农民习惯施肥（FP）;基于测土配方施肥或当地农技推广部门推荐施肥（ST）;NE推荐基础上不施氮肥（NE-N）;NE推荐基础上不施磷肥（NE-P）;NE推荐基础上不施钾肥（NEK）。结果表明,沙湾、昌吉和巴楚试验点,NE处理产量高于ST和FP处理,其中沙湾分别增产4.71%和6.68%,昌吉分别增产5.53%和9.58%,巴楚分别增产5.81%和9.47%。3个试验点中,NE较ST和FP处理分别增收2682.13～4027.40和4278.95～6895.06元/hm2。NE处理在增产的同时也能提高养分吸收及肥料利用率,沙湾NE处理氮、磷、钾肥利用率显著高于ST和FP处理,分别提高14.65%和9.08%、10.93%和15.92%、7.26%和8.53%。昌吉NE处理氮肥利用率显著高于FP处理,提高21.69%;昌吉NE处理磷、钾肥利用率显著高于ST和FP处理... 相似文献
3.
基于养分专家系统的侧深施肥技术对宁夏引黄灌区水稻产量与养分利用的影响 总被引：2，自引：0，他引：2
为了寻求合理施用肥料与改善水稻养分利用的有效措施,通过2016—2018年在宁夏引黄灌区开展的8组田间试验,研究基于养分专家系统的侧深施肥技术(NE-SD)对水稻产量与养分利用率的影响。结果表明:与农民习惯施肥(FP)处理相比,养分专家系统(NE)处理在减氮24.85%、减磷24.78%、增钾90.71%的基础上,稻谷增产4.71%;氮素、磷素、钾素累积量分别增加2.24%,4.40%,15.09%;氮肥、磷肥、钾肥利用率分别增加9.84,8.78,1.99个百分点;氮肥、磷肥、钾肥农学效率分别增加4.73,7.69,1.54 kg/kg。基于养分专家系统的侧深施肥技术,能够深化4R养分管理方法,表现出较好的应用效果。与FP处理相比,NE-SD处理稻谷增产7.53%;氮素、磷素、钾素累积量分别增加3.92%,7.87%,18.74%;氮肥、磷肥、钾肥利用率分别增加11.09,11.32,5.82个百分点;氮肥、磷肥、钾肥农学效率分别增加5.87,11.31,3.54 kg/kg。因此,在宁夏引黄灌区,NE推荐施肥与NE推荐施肥的基础上,采用侧深施肥技术2种施肥方法均能在减少肥料投入的基础上,增加稻谷产量,增加水稻养分累积量,提高养分利用率,降低土壤氮素、磷素盈余。 相似文献
4.
养分专家系统推荐施肥对苏北地区水稻产量和肥料利用率的影响 总被引：8，自引：2，他引：8
苏北地区水稻集约化种植体系中存在氮肥施用过量、施肥时期与肥料配比不合理、肥料利用率低等现象,是农民收益增加和农业可持续发展的限制因子。为科学、系统地指导苏北地区稻田施肥,提高水稻养分利用效率并降低环境风险,本研究基于地块土壤性状、产量目标及养分管理措施等信息,运行水稻养分专家系统(Nutrient Expert System, NE)进行施肥推荐,并通过田间试验比较了NE推荐施肥对苏北地区水稻产量、经济效益、养分吸收、肥料利用率的影响。试验共设置5个处理,分别为水稻养分专家系统推荐施肥(NE),基于NE处理的减氮(NE-N)、减磷(NE-P)和减钾(NE-K)处理,以及农民习惯施肥(FP)。结果表明:与FP处理相比, NE处理的氮、磷肥偏生产力分别提高44.77%和6.32%,其中氮肥偏生产力达到显著水平(P0.05);钾肥偏生产力显著降低33.55%(P0.05);氮肥、钾肥回收利用率显著提高4.91%、19.35%,磷肥回收利用率与FP处理基本相同。相比于FP处理,NE处理在减少氮肥投入,保证氮、磷、钾肥平衡施用的条件下,水稻增产2.23%,增收6.24%,但差异不显著;水稻植株籽粒中磷和钾积累量分别增加10.32%和51.63%,其中后者达显著水平(P0.05)。综上所述,水稻养分专家系统在苏北地区依据地块信息和智能化施肥系统,指导优化了氮、磷、钾肥的施用量和施用方法,促进了水稻对氮、磷、钾养分的吸收和利用,提高了肥料利用率,具有较好的增产增收效果,可以在苏北地区推广应用。 相似文献
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基于养分专家系统的侧深施肥技术对宁夏引黄灌区 总被引：1，自引：0，他引：1
为了寻求合理施用肥料与改善水稻养分利用的有效措施,通过2016—2018年在宁夏引黄灌区开展的8组田间试验,研究基于养分专家系统的侧深施肥技术（NE-SD）对水稻产量与养分利用率的影响。结果表明：与农民习惯施肥（FP）处理相比,养分专家系统（NE）处理在减氮24.85%、减磷24.78%、增钾90.71%的基础上,稻谷增产4.71%;氮素、磷素、钾素累积量分别增加2.24%,4.40%,15.09%;氮肥、磷肥、钾肥利用率分别增加9.84,8.78,1.99个百分点;氮肥、磷肥、钾肥农学效率分别增加4.73,7.69,1.54 kg/kg。基于养分专家系统的侧深施肥技术,能够深化4R养分管理方法,表现出较好的应用效果。与FP处理相比,NE-SD处理稻谷增产7.53%;氮素、磷素、钾素累积量分别增加3.92%,7.87%,18.74%;氮肥、磷肥、钾肥利用率分别增加11.09,11.32,5.82个百分点;氮肥、磷肥、钾肥农学效率分别增加5.87,11.31,3.54 kg/kg。因此,在宁夏引黄灌区,NE推荐施肥与NE推荐施肥的基础上,采用侧深施肥技术 2种施肥方法均能在减少肥料投入的基础上,增加稻谷产量,增加水稻养分累积量,提高养分利用率,降低土壤氮素、磷素盈余。 相似文献
6.
为评价养分专家系统(NE系统)在大葱上的推荐施肥效果,在章丘大葱主产区,选取多年大葱种植地进行田间试验,并分析了NE系统与农民习惯施肥(FP)处理、当地农技部门的测土配方推荐施肥(OPTs)处理下大葱产量、经济效益、养分吸收积累、肥料利用率和土壤硝态氮积累的变化。结果表明,NE系统推荐施肥较FP处理氮、磷、钾肥施用量分别降低了13.22%、27.33%和16.51%,较OPTs处理氮、磷肥用量增加而钾肥用量降低;大葱NE系统较FP和OPTs分别增产6.04%和12.30%,增收8.01%和14.74%;NE处理氮素积累量较FP和OPTs处理分别显著增加14.20%和37.78%,磷积累量分别增加21.22%和25.78%,但差异不显著,钾积累量分别显著增加16.78%和22.13%;NE处理氮肥农学效率平均为71.78 kg/kg,氮肥利用率平均为25.10%,氮肥偏生产力较FP提高22.22%;NE处理较FP、OPTs处理可分别显著降低0～90 cm土层硝态氮积累量39.44%和38.72%。大葱NE系统推荐施肥促进了大葱对养分的吸收和利用,具有明显的增产增收效应,肥料利用效率高于全国平均水平,降低了土壤硝态氮积累风险,可作为该地区大葱推荐施肥方法推广应用。 相似文献
7.
为评价小麦养分专家系统(Nutrient Expert,NE)推荐施肥对冬小麦产量效应、养分利用率和农田环境效应的影响,对2010~2014年期间在河北省开展的83个小麦试验进行了分析。结果发现:小麦养分专家系统推荐施肥量较农民习惯施肥量氮、磷肥分别降低了47.0%和10.4%,钾肥增加了102.0%;小麦养分专家系统推荐施肥较农户施肥增产在2.6%~13.0%之间,氮、磷、钾肥利用率分别为31.7%、10.9%和31.0%,氮肥偏生产力为47.9kg/kg,显著高于农民习惯施肥处理24.7 kg/kg;小麦养分专家系统推荐施肥的农田温室气体排放总量和排放强度分别为2 211 kg CO_2 eq/hm~2和332 kg CO_2 eq/t,显著低于农民习惯处理的3 720 kg CO_2 eq/hm~2和589 kg CO_2 eq/t。小麦养分专家系统推荐施肥提高了养分利用率、降低了农田温室气体排放,可以在河北省小麦主产区推广应用。 相似文献
8.
基于养分专家系统推荐施肥在东北玉米上的长期综合效应 总被引：2，自引：0，他引：2
为明确养分专家系统推荐施肥对东北玉米产量与收益、肥料利用率与土壤养分的长期综合效应,于2012-2020年开展了田间定位试验,共设置5处理：分别为1）不施肥（CK）;2）农民习惯施肥（FP）;3）养分专家系统推荐施肥（NE）;4）在NE基础上配施缓/控释氮肥（NER）;5）土壤测试推荐施肥（ST）。探究9 a 产量与收益、肥料利用率、土壤养分和养分平衡的变化规律。结果表明,NE和ST处理较FP处理显著降低了氮磷肥用量（P<0.05）,显著增加了钾肥用量（P<0.05）。与FP处理相比,NE、NER和ST处理提高了玉米产量、收益及其稳定性。其中均以NE处理最高,之后依次为ST和NER处理。NE、NER和ST处理肥料平均回收利用率、农学利用率和偏生产力较FP处理分别提高了29.0%～40.1%（P<0.05）、31.3%～44.3%（P<0.05）和22.0%～31.7%（P<0.05）,且均以NE处理最高。与FP处理相比,NE、NER和ST处理提高了0～30 cm土壤无机氮含量,降低了30～90 cm土壤无机氮和0～30 cm土壤有效磷含量,而不同施肥处理土壤速效钾含量差异未达显著水平（P>0.05）,其中NE处理与试验起始养分含量最为接近。9 a养分平衡结果显示,FP、NE、NER和ST处理氮、磷均表现为盈余,而钾素表现为亏缺,且NE处理氮、磷盈余量和钾亏缺量均为最低。综上,与农民习惯施肥和土壤测试推荐施肥相比,养分专家系统推荐施肥不仅可提高玉米产量、收益和肥料利用效率,并可保持土壤养分稳定。因此,它是一种适用于中国东北玉米的推荐施肥方法。 相似文献
9.
基于2017～2018年在马铃薯主产区内蒙古武川县开展的60组田间试验,通过不同马铃薯产量区间研究产量效应、养分吸收量、肥料利用效率以及养分平衡等指标,验证养分专家系统推荐施肥方法在内蒙古马铃薯主产区的应用效果与适用性。结果表明:在马铃薯低产、中产和高产区间中,养分专家系统推荐施肥(NE)处理的氮肥(N)用量较农民习惯施肥(FP)处理分别减少16、23和25 kg/hm~2,但产量较FP处理分别提高1.2、2.0和2.6 kg/hm~2,且氮肥利用率和氮肥农学效率较FP处理分别提高了6.2%、6.8%、7.3%和11.1、15.2、16.6 kg/kg。NE较FP处理的氮(N)、磷(P_2O_5)、钾(K_2O)肥的农学效率分别提高14.3、13.1和7.1 kg/kg,肥料回收率分别提高6.8、3.4和6.9个百分点。总体而言,马铃薯养分专家推荐施肥方法具有减肥增产的良好效果,且在中产和高产区间中NE养分专家系统的应用效果更佳。 相似文献
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【目的】我国马铃薯种植区存在盲目施肥、过量施肥、养分比例不平衡等现象,进而导致肥料利用率低、养分损失大等。通过开展田间试验,利用基于产量反应和农学效率的马铃薯养分专家系统进行推荐施肥,并以农民习惯施肥和常规测土施肥推荐结果对该系统的有效性进行验证,为不同生产条件下的马铃薯生产提供简便易行、高效的推荐施肥方法。【方法】于2017—2020年,在马铃薯主产区共9省份开展了239个田间试验,每个试验包括6个处理,分别为基于马铃薯养分专家系统推荐施肥(NE)、农民习惯施肥(FP)、土壤测试施肥(ST),以及基于NE的不施氮、不施磷和不施钾处理。调查马铃薯产量、经济效益、养分利用率和表观养分平衡。【结果】我国马铃薯主产区施用氮、磷和钾肥的平均产量反应分别为8.1、4.8和5.2 t/hm2,农学效率分别为45.2、51.1和35.1 kg/kg,相对产量分别为0.73、0.83和0.82。与FP和ST处理相比,NE处理的氮肥用量分别降低了24.4%和4.2%,磷肥用量分别降低了32.3%和1.9%,但钾肥用量均增加了4.9%;马铃薯产量分别提高了2.63和0.62 t/hm... 相似文献
11.
An experiment was conducted to find out how humic substances affected nutrient uptake of plants. The test plants, oregano, thyme, and basil, were grown in nutrient film technique at two pH levels (4.5 and 6.5), in two substrates (peat and perlite), and at three levels of humic substance that was a peat extract (control, low, and high concentration). Nutrient uptake of potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), zinc (Zn), and copper (Cu) were determined by elemental contents in aerial parts of the plant and its weight. Humic substance had no effect on K, Ca, and Mg uptake but lowered the uptake of Fe, Mn, Zn, and Cu for the three test plants, more pronounced with perlite than peat and more at low pH than at high pH. The lowering of the uptake might be caused by complexation of Fe, Mn, Zn, and Cu by the humic substance and the lower availability of these metals in complexed form than as a cation or as EDTA‐chelate in the case of Fe. It is not clear why the effect of the humic substance on micro‐element uptake is larger at low than at high pH. The complexation is expected to be stronger at pH 6.5 than at pH 4.5. At low pH, the high concentration of humic substance caused a low fresh weight of the shoots, perhaps caused by a toxicity of the humic substance at low pH. This was less pronounced at high pH. 相似文献
12.
S.P. Mazumdar D.K. Kundu A.R. Saha B. Majumdar R. Saha A.K. Singh 《Archives of Agronomy and Soil Science》2018,64(11):1595-1607
Impacts of 43-year nutrient management on carbon (C) and nutrient dynamics were studied in a rice-wheat-jute system in tropical India. Carbon dynamics was investigated on the basis of its distribution of labile (microbial biomass C, permanganate oxidizable C and water soluble C) and slow pools (Walkley Black oxidizable organic C), its indices (C pool index, lability index) and C management index (CMI) at different soil depths. Nutrient dynamics was judged by major nutrients availability, and related soil enzymatic activities. We studied seven treatments including unfertilized control, 100% NPK (N:P2O5:K2O 60:30:60), 50% NPK, 150% NPK, 100% NP, 100% N, 100% NPK + farm yard manure (10 tonnes FYM ha?1). Nutrients availability and soil enzymatic activities were significantly increased under balanced fertilization (100% NPK + FYM) over other treatments. Labile, slow and total C was also found highest in 100% NPK + FYM. Enhanced C indices under 100% NPK + FYM over 100% NPK and other treatments signified the importance of long term balanced fertilization on soil C stabilization. Lability indexes were lower at sub-soil (30-45cm). In terms of favourable nutrient dynamics and CMI, balanced application of NPK plus organics were recommend for long term sustainability of rice-wheat-jute system in tropics. 相似文献
13.
J. Ollivier A. Flori B. Cochard P. Amblard N. Turnbull I. Syahputra 《Journal of plant nutrition》2017,40(4):558-573
Observations of the vegetative and reproductive biomass produced annually and the mineral element contents have been conducted on diverse oil palm plant materials tested in a genetic test in Indonesia. The results show that the nutrient uptake (for trunk growth, leaf renewal and bunch export) greatly varies (CV = 10% for N uptake and 17% for K uptake) with the origins of the planting materials considered. For equivalent production, the uptake in nutrients of certain plant material may differ very significantly; for the same level of uptake in nutrients, production can vary significantly. This study supports the hypothesis that the optimal nutrient thresholds are intrinsically linked to the plant material. It assumes that some planting materials have different needs and that a fertilizer regime could be adapted to their specific needs without losses in performance. To confirm these assumptions, the need of implementing specific experimental devices with differentiated fertilization regimes is discussed. 相似文献
14.
Christiano da Conceio de Matos Rafael da Silva Teixeira Ivo Ribeiro da Silva Maurício Dutra Costa Antonio Alberto da Silva 《植物养料与土壤学杂志》2019,182(2):286-295
The elemental ratios of plant tissues are associated with the adaptive and competitive success of a plant species in an ecosystem. So far, no study has evaluated if and how crop–weed competition influences the elemental ratios of competing populations, although such information is important to understand weed infestation dynamics and to improve weed management in agroecosystems. The objective of this study was to analyze weed–crop elemental ratios during interspecific competition between weeds and crops in greenhouse experiments. For this, maize (Zea mays L.) and the weeds Amaranthus viridis L, Bidens pilosa L., and Ipomoea grandifolia (Dammer) O'Donell were grown under seven treatments: maize and weed monocultures, and maize in competition with weeds. Competition between plants practically did not influence growth and nutrient contents of maize but reduced weed growth and nutrient uptake. Maize showed few changes in elemental ratios. In contrast, B. pilosa and I. grandifolia were very sensitive to competition and showed significant increases in C : N, C : P, C : K, N : P, and N : K ratios when grown with maize. A. viridis showed low flexibility of nutrient : nutrient ratios under the same competitive pressure as that faced by B. pilosa and I. grandifolia. The interspecific competition led to increases only in the C : P ratio of A. viridis shoots. Therefore, interspecific competition changes the elemental ratios, mainly of the weeds, and the magnitude of this change is dependent on the plant species involved. Interspecific competition changes plant biomass quality (higher C : nutrient ratios), mainly for B. pilosa and I. grandifolia. 相似文献
15.
在河北省不同区域棉区选择代表县市,通过调查分析和氮、磷、钾3414试验的方法,研究冀南棉区、冀中南棉区及滨海盐渍土棉区的土壤氮、磷、钾养分丰缺现状和养分管理技术。结果表明:冀南棉区土壤速效钾含量偏低成为本区域的制约因素,养分调控原则为稳氮、补磷、増钾,N、P2O5、K2O适宜用量分别为135、110、150 kg/hm2,专用肥适宜配方为15-13-17;冀中南棉区土壤速效养分含量较为均衡,养分调控原则为稳氮、稳磷、补钾,N、P2O5、K2O适宜用量分别为140、90、120 kg/hm2,专用肥适宜配方为18-12-15;滨海盐渍土棉区土壤养分含量极度不平衡,土壤有效磷含量极低、速效钾含量很高,养分调控原则为控氮、增磷、控钾,N、P2O5、K2O适宜用量分别为135、130、90 kg/hm2,专用肥适宜配方为17-16-12。 相似文献
16.
不同养分配比对高粱根系生长及养分吸收的影响 总被引：2，自引：0，他引：2
为探明高粱养分吸收和根系生长对氮、磷、钾胁迫的响应,通过长期定位试验,在高粱/玉米轮作条件下研究了不同养分配比NPK、PK、NK、NP、CK对高粱根系生长及养分吸收的影响。结果表明:与NPK相比,长期不施氮肥(PK)条件下高粱总根长增加18.29%,总根体积降低26.52%,且根系主要分布在0~10 cm土层,直径小于0.5 mm细根所占比例显著增加。不施磷肥(NK)显著抑制了高粱根系生长,总根长、总根表面积和总根体积分别降低24.03%、27.48%和41.29%。不施钾肥(NP)对细根生长有明显抑制作用。不施氮、磷、钾均降低高粱对相应养分的吸收和累积,不施氮促进了营养器官中氮和钾素向籽粒转运,不施磷或钾肥抑制了氮、磷及钾的转运。高粱对养分的吸收、积累和转运与根系形态有关,不同养分积累与运转与根系形态关系表现不尽相同:氮素、钾素积累和转运与根系形态具有较好的相关性,氮素的积累和转运与植株生物量和产量的相关性大于磷素和钾素。综上,高粱根系形态及养分吸收对氮、磷及钾胁迫响应不同,该研究可为不同养分瘠薄地高粱高效栽培提供理论依据。 相似文献
17.
Total dry matter (TDM) and nutrient accumulation, nutrient partitioning, and cumulative growing degree days at the time of maximum nutrient accumulation for two‐row spring barley (Hordeum vulgare L.) are not well quantified under high‐yielding irrigated conditions common in the semi‐arid western United States. Thus, five cultivars of barley were grown under irrigated conditions on a loam soil in the 2015 and 2016 growth seasons to determine these factors. Total nutrient accumulation was greatest at either the soft dough or maturity stage where specific nutrients were greater at one stage as compared to the other. Mean N accumulation was greatest at the soft dough stage (256 kg ha?1) where the regression model accounted for 80% of the variation in the data. Additionally, spike N increased from 91 to 105 kg ha?1 from soft dough to maturity. Specific nutrients (e.g., K) had significantly greater plant (i.e., culms plus leaves) accumulation between soft dough and maturity, 253 and 172 kg ha?1, respectively, where the spike at the same growth stages had an accumulation of 37 and 42 kg ha?1, respectively. In contrast, other nutrients (e.g., P) were remobilized to the spike as noted by the increase from 14 kg ha?1 at soft dough to 26 kg ha?1 at maturity. In addition to nutrient partitioning, linear regressions resulted in well‐correlated models between TDM and total nutrient accumulation (R2 = 0.35–0.88) for measured nutrients. Results from the current study provide critical data on nutrient accumulation as well as regression models for two‐row barley under high‐yielding conditions. This information can be used to improve harvest decisions as well as more accurately predict nutrient cycling in barley cropping systems. 相似文献
18.
Summary The direct contribution made by soil arthropods to nutrient dynamics was investigated in pine forests that differed in soil nutrient status. Nutrient concentrations (K+, Ca2+, Mg2+, PO
4
3–
, N, C) in the most abundant species and groups of arthropods in two Pinus nigra forests were compared, and distinct differences were found among taxonomic groups. In the rank order: collembolans, oribatides, isopods, diplopods, Ca2+ and Mg2+ concentrations increased, while N and C concentrations decreased. The nutrient concentrations in individuals of the same species but originating from the different forests were similar, except for the isopod Philoscia muscorum. The total and available nutrient concentrations in food and faeces of the collembolan Tomocerus minor and the isopod Philoscia muscorum were compared. The isopod faeces contained relatively less K+ and Mg2+, and more Ca2+, PO
4
3–
, and greater N availability, compared with the food material. The collembolan faeces showed a higher availability of all nutrients measured. The N species appeared to be changed by collembolans; their faeces contained high NO
3
–
concentrations, while their food contained relatively high concentrations of NH
4
+
. These findings were examined in relation to their significance for ecosystem functioning. It was concluded that about 12% of the total K+, PO
4
3–
, N and 2% of the Ca2+ in the organic layer was found in the mesofauna. It was calculated that faeces production by the collembolans resulted in a 2.4 times higher NO
3
–
availability in the forest floor. 相似文献
19.
减量施肥下小麦产量、肥料利用率和土壤养分平衡 总被引：28，自引：7，他引：21