共查询到19条相似文献，搜索用时 109 毫秒
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通过对雷州半岛蔗区甘蔗营养状况的普查，利用数理统计方法，分析了养分间、养分与经济性状间的相关关系。结果表明：增N、提高土壤pH值可显著提高茎长，茎长的提高可促进单茎重、工业蔗产量、含糖量极显著提高。增K、Mg可显著提高有效茎，有效茎的提高可促进工业蔗产量显著提高，却导致锤度显著下降。偏施Mg会导致锤度极显著下降。因而采取的措施为增N、K，合理配施镁含量低的石灰和P肥，以促进茎长、单茎重、有效茎的提高，从而提高产量；控施Mg肥，达到提高糖分含量的目的。 相似文献
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研究了淮北平原砂姜黑土地区生姜氮钾配施的增产效应和对土壤养分的影响。结果表 明:氮钾配施可以大幅度提高生姜的产量,施钾的增产幅度,柴姜为15.3%～58.4%,平均增产率 为35.8%;狮子头姜产量提高18.2%～46.9%,平均增产28.7%。增施氮钾肥可有效提高土壤有 机质、全N、有效P、速效K、缓效K、有效Ca和有效Mg含量,降低NO3-盐含量,促使土壤pH趋于 中性,对全P和碱解N含量影响较小。土壤N素和P素大量盈余,不施钾时土壤K亏损严重,施钾 处理土壤钾基本上处于盈余状态,有利于维持和提高土壤肥力。 相似文献
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研究了淮北平原砂姜黑土地区生姜氮钾配施的增产效应和对土壤养分的影响。结果表明：氮钾配施可以大幅度提高生姜的产量，施钾的增产幅度，柴姜为15．3％～58．4％，平均增产率为35．8％；狮子头姜产量提高18．2％～46．9％，平均增产28．7％。增施氮钾肥可有效提高土壤有机质、全N、有效P、速效K、缓效K、有效Ca和有效Mg含量，降低NO3-盐含量，促使土壤pH趋于中性，对全P和碱解N含量影响较小。土壤N素和P素大量盈余，不施钾时土壤K亏损严重，施钾处理土壤钾基本上处于盈余状态．有利于维持和提高土壤肥力。 相似文献
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一、单质农用矿物对水稻的生育性状、产量的影响
黑龙江省农业科学院土壤肥料研究所盆栽试验结果表明，单质钾长石、沸石、蛇纹石这3种农用矿物对水稻的生育状况改善和产量的提高具有明显的促进作用。在不施无机肥料的情况下，与空白对照相比，每亩施入5kg沸石粉（Si）、蛇纹石（Mg）、钾长石（K），水稻植株高度分别增加4．82cm、2．66cm和3．84cm；平均穗长分别增加0．10cm、0．03cm和0．04cm； 相似文献
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凌大炯 《广东海洋大学学报》1998,(3)
为探讨青优湛2植株营养规律及其与产量的构成关系,对不同氮肥施用量（配合施磷钾肥）的植株营养进行了研究。结果表明：施用氮素能使青优湛2极显著地增产;不同施氮量的植株氮、磷、钾以及不同生育期的植株氮、磷钾含量均达极显著差异;植株氮出现高峰值的时期随施氮数量而异;氮磷钾配合施用的植株磷含量呈向上的波浪形规律、植株钾含量呈倒“N”形规律;分化三期植株氮、始穗期的植株磷和植株钾是影响产量的最重要因子。根据研究结果,建议在“高氮、低磷、控钾”的前提下,氮、磷、钾分别采用不同的施肥原则。 相似文献
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通过野外采样和室内测定,以日照茶树种植区3个典型茶园为研究对象,每个茶园分别取鸠坑、黄山群体、福鼎大白各3个品种,最终取得9种茶样生长地的土样,研究分析土样的pH,有机质,全N,P,K,有效N,P,K等指标的土壤养分含量状况,并以此为评价指标,运用模糊综合评判法,对3个茶园的土壤肥力质量进行了综合评价。结果表明,茶园肥力综合水平为北垛春>碧波山庄>北叶青;茶园土壤总体上,pH值较适中,有机质含量很缺乏,全N含量偏低,全P含量中等,全K含量较高,有效N含量很缺乏,有效P含量非常丰富,有效K含量中等,并据此提出了关于该地区3个典型茶园今后合理施肥的一些建议。 相似文献
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文章以南宁市六城区、武鸣县和横县部分地区共1.1万km2的区域为研究区,采集2771件表层土壤组合样品,分析了N、P、K2O的含量,并运用Gis和地统计学方法,分析了养分含量的平均水平、概率分布特征、空间异质性和空间分布特征.土壤养分的空间分布特征研究为因地制宜开展施肥工作和有效利用土壤提供了依据. 相似文献
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不同甘蔗品种锤度与糖分的关系 总被引：2，自引：0，他引：2
使用大田实验数据和实验室数据建立了实验室锤度和田间锤度与甘蔗糖分关系的数学模型。统计分析表明 ,实验室锤度、田间锤度与糖分间均存在显著的线性关系 ,并且实验室锤度———糖分关系与大田锤度———糖分关系存在显著性 (α =0 .0 5 )差异 ;而不同甘蔗品种间的田间锤度———糖分关系无显著性差异 (α =0 .0 5 )。故不同的取样方法应使用不同的方程来估计甘蔗糖分 ;而不同甘蔗品种间田间锤度———糖分关系可用同一模型来描述。对三个供试甘蔗品种应用该模型进行实测验证 ,实测与预测值的相对误差均在 7%以内。 相似文献
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以３０个甘蔗栽培品种为材料，用垂直平板聚丙烯酰胺凝胶电泳方法，对过氧化物酶同工酶进行分析，统计比较各酶带出现的频率与甘蔗主要性状的关系．结果表明：Ａ６、Ｂ３酶带同时出现时１００％为高糖品种，因此Ａ５、Ｂ３酶带与高糖性状关系极为密切；Ａ６、Ａ８、Ｂ３、Ｂ７酶带单独存在时也与高糖性状有关；早熟种与Ａ５、Ｂ３、Ｂ７酶带的存在有关；中小茎种和中茎种分别与Ａ４、Ｂ５酶带的存在有关。 相似文献
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以“粤糖63／237”为对照品种进行新植、宿根共3年的对比试验，结果表明，“新台糖10号”的新植、宿根的蔗茎产量及蔗糖份均高于对照品种。“新台糖10号”是适合遂溪县蔗区种植的早熟、高产、高糖以及宿根性好的甘蔗品种。 相似文献
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ＣＨＡＮＧＥ ＯＦ ＮＵＴＲＩＥＮＴ ＩＭＰＯＲＴ ＡＮＤ ＥＸＰＯＲＴ ＩＮ ＰＲＯＣＥＳＳ ＯＦ ＲＡＩＮＦＡＬＬ ＩＮ ＡＩＬＡＯ ＭＯＵＮＴＡＩＮ ＯＦ ＹＵＮＮＡＮ ＰＲＯＶＩＮＣＥＧａｎＪｉａｎｍｉｎ（甘健民）；ＸｕｅＪｉｎｇｙｉ（薛敬意... 相似文献
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Analysis of cold tolerance on mangroveKandelia candel leaf growing in different soil salinity along Jiulong River Estuary in South China showed that the cold tolerance decreased
as the increase of soil salinity. The lethal temperatures ofK. candel leaf were −10.4, −9.9 and −8.6 °C in Liaodong, Baijiao and Aotou, respectively. Under 1–2°C cold stress treatment on detached
leaves ofK. candel, their caloric value gradually decreased, while electrolyte leakage gradually increased. The leaf's caloric value and electrolyte
leakage in Aotou with higher soil salinity varied more largely than those in Liaodong with lower soil salinity. InK. candel leaf, total water content lowered a little, bound water content rose significantly and free water content dropped significantly
with duration of cold stress. At the same time, reduction sugar, soluble sugar and starch content gradually decreased and
sucrose content gradually increased. Bound water, free water and sucrose content inK. candel leaf from Aotou with higher soil salinity changed more slowly than those from Liaodong with lower soil salinity, but reduction
sugar, soluble sugar and starch content inK. candel leaf from Aotou had faster variations than those from Liaodong. These data indicated that soil salinity can reduce cold tolerance
ofK. candel leaf by increasing negative effect of salt ions in cell membrane, inhibiting variations of water content, and aggravating
consumption of material and energy.
Supported by the Found for Outstanding Young Teacher, the Ministry of Education, China. 相似文献
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Birendra Nath Ghosh Om Pal Singh Khola Ranjan Bhattacharyya Kuldeep Singh Dadhwal Prasant Kumar Mishra 《山地科学学报》2016,13(4):754-762
Plots under conservation tillage may require higher amount of potassium (K) application for augmenting productivity due to its stratification in upper soil layers, thereby reducing K supplying capacity in a medium or long-term period. To test this hypothesis, a field experiment was performed in 2002-2003 and 2006-2007 to study the effect of K and several crop rotations on yield, water productivity, carbon sequestration, grain quality, soil K status and economic benefits derived in maize (Zea mays L)/cowpea (Vigna sinensis L.) based cropping system under minimum tillage (MT). All crops recorded higher grain yield with a higher dose of K (120 kg K2O ha-1) than recommended K (40 kg K2O ha-1). The five years’ average yield data showed that higher K application (120 kg K2O ha-1) produced 16.4% (P<0.05) more maize equivalent yield. Cowpea based rotation yielded 14.2% (P<0.05) higher production than maize based rotation. The maximum enhancement was found in cowpea-mustard rotation. Relationship between yield and sustainable indices revealed that only agronomic efficiency of fertilizer input was significantly correlated with yield. Similarly, higher doses of K application not only increased the water use efficiency (WUE) of all crops, but also reduced runoff and soil loss by 16.5% and 15.8% under maize and 23.3% and 19.7% under cowpea cover, respectively. This study also revealed that on an average 16.5% of left over carbon input contributed to soil organic carbon (SOC). Here, cowpea based rotation with the higher K application increased carbon sequestration in soil. Potassium fertilization also significantly improved the nutritional value of harvested grain by increasing the protein content for maize (by 9.5%) and cowpea (by 10.6%). The oil content in mustard increased by 5.0% and 6.0% after maize and cowpea, respectively. Net return also increased with the application of the higher K than recommended K and the trend was similar to yield. Hence, the present study demonstrated the potential yield and profit gains along with resource conservation in the Indian Himalayas due to annual additions of higher amount of K than the recommended dose. The impact of high K application was maximum in the cowpea-mustard rotation. 相似文献
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Regular distribution patterns of elements Ca, Sr, K, Na, Mg, Fe, Mn, Ti, Cu, Co, Ni, Zn, Pb, Cr, Rb, Ba, Cd, and U in Late
Quaternary strata have been studied in detail. The regional variation patterns of elements in these strata are similar to
those in recent surface sediments, showing that the sedimentary environment has been relatively stable since Late Quaternary.
Element distribution changes with the variations of lithological characters. Contents of Ca and Sr increase in coarse sediments,
while those of other elements decrease. Na content increases in the pumice layer. Mn, content tends to increase sharply towards
the surface layer. Ca content decreases sharply in strata where water depth is more than 2,000 m. The strata can be divided
based on the distribution curves of element assemblages. The variations in contents of most elements in Holocene Series are
smaller than those in Late Pleistocene Series, which might be related to the factors of glacial and interglacial changes,
sea level fluctuations and material source differences.
Contribution No. 1488 from Institute of Oceanology, Academia Sinica 相似文献
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Mud crab (Scylla serrata) is an important commercial crustacean in China. An experiment was designed to study the effect of cold stress on S. serrata. After a one-week adaptation at 28oC, the temperature is suddenly reduced to 4oC. The crabs were sampled every 2 h for 10 h and dissected immediately to measure the enzyme activity. The crabs at room temperature (28oC) were used as the control group. The activity of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPX), the content of malondialdehyde (MDA) and the activity of 4 ATPases (Na , K -ATPase; Mg2 -ATPase; Ca2 -ATPase; Ca2 , Mg2 -ATPase) were measured biochemically. In contrast to the control group, the SOD activity increased significantly from 2 to 6 h after the cold stress, and then decreased. The CAT and GPX activities increased in 2 h, and then decreased gradually. The content of MDA increased gradually in 4 h. The activity of Na , K -ATPase decreased in 2 h, increased up to the top value at Hour 6, then decreased again. The activities of Mg2 -ATPase, Ca2 -ATPase and Ca2 , Mg2 -ATPase increased significantly in 6 h, insignificantly in any other hours. Under cold stress, the activity of antioxidative enzymes in S. serrata was reduced at first then stabilized, ROS-scavenging weakened, and MDA accumulated gradually in the gill after 6 h. The activity of the 4 ATPases in the crab decreased after 6 h, suggesting that the ability to regulate ion concentration has been paralyzed. Therefore, the maximum period to sustain healthy meat in the crab under cold stress is 6 hours. 相似文献
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New technologies and systems for high quality citrus fruit production,labor-saving and orchard construction in mountain areas of Japan 总被引：4，自引：1，他引：3
KunihisaMORINAG~ OsamuSUMIKAWA OsamuKAWAMOTO HiroyasuYOSHIKAWA SeijiNAKAO MasahikoSHIMAZAKI Shin-no-sukeKUSABA NorihiroHOSHI 《山地科学学报》2005,2(1):59-67
Novel technologies have been necessary for improving fruit quality and productivity of citrus,labor-saving and orchard conservation on steep slope lands since aging of growers and decrease in the number of successors is remarkable in mountain areas of southwestern Japan. The purpose of this paper is to introduce new technologies for improving citrus production that have been developed in recent years. A new fruit quality control system using drip irrigation and liquid fertilization technique combined with year-round plastic mulching was developed, and it enables high quality and stable citrus fruit production. Water and/or nutrient solution is automatically supplied through drip tubes that are laid under the mulching sheets to give adequate water stress, so as to improve sugar and acid content of fruit. A new transportation system for steep sloping citrus orchards, which is a combination of the monorail system and contour narrow paths, was suggested. A small walking cultivator was developed to explain the procedure of narrow path excavation. After introducing the narrow path, working hours for fertilizer and chemicalherbicide application were reduced. Disasterpr evention mapping of citrus orchards on slope landswas developed based on computer-aided seepage estimation and topographic data. The mapping can show zones of both ascending flow and descendingflow of underground water during heavy rains incitrus orchards. The mapping is considered to be effective for the management of orchards andprevention of erosion on slope lands. 相似文献