不同小麦品种在缺锰土壤上的生长和产量   总被引：1，自引：0，他引：1  

吕世华 《四川农业大学学报》1993,11(1):27-31

在严重缺锰土壤上设置田间试验观察了12个小麦品种对缺锰的反应。不同品种在缺锰症出现时间、症状轻重、幼苗生长、分蘖成穗、籽粒产量及时锰肥的反应各不相同。川麦22、绵阳11等不耐缺锰_而“951”在不施锰条件下也有较高的产量,表现了较强的耐性。  相似文献   

植物生长调节剂对杂交水稻制种产量影响的试验研究   总被引：2，自引：0，他引：2  

徐坤  赵益强  赵宗贤 《四川农业大学学报》2001,19(4):359-361

探讨了在水稻始穗期用云大 - 12 0水剂、赤霉素、三十烷醇 3种植物生长调节剂处理不育系Ⅱ - 32 - 8A对杂交水稻制种产量的影响 ,结果证明该不育系在喷施赤霉素后效果最好 ,能使每 6 6 7m2 产量比对照提高 4 3 16 % ,异交结实率比对照提高 2 3 0 6 % ,千粒重比对照增加 1 16 %。  相似文献   

杂交高粱株型和产量性状间的典范相关分析     

冯宗云 《四川农业大学学报》1992,10(1):135-139

本文用典范相关分析方法研究了杂交高粱株型性状与产量性状间的关系。结果表明:株高、叶向值与穗粒数、千粒重之间的典范相关系数为0.6365(P<0.05),相关信息比为67.27％;并在第一对典范相关变量的回归直线V_1=0.6365u_1上按各组合点间的亲疏关系把供试的23个组合划分为四类,类内各组合的产量差异不显著,而类间差异达显著或极显著水平;今后应把叶向值列为高梁理想株型育种的主要性状。  相似文献   

桃树黄化病施铁矫正的效果   总被引：2，自引：0，他引：2  

吕世华 《四川农业大学学报》1994,12(2):227-230

１９９２－１９９３年在有严重黄化病的桃树上进行施铁试验。用根系输入法施用ＴＬ－Ｆｅ，７－１０天即可使叶片转绿，复绿果达１００％，并使叶片含铁量增加７１．２％，叶绿素增加３．４倍，过氧化氢酶活性提高５倍，单株挂果数增加４．２倍。果重增加７０．９％，果实品质也得到明显改善。  相似文献   

桃疏果套袋试验初报     

廖明安  胡万文 《四川农业大学学报》1992,10(1):140-144

1990-1991年,在四川省江油市对桃进行了疏果套袋试验研究。结果表明,通过疏果套袋,单株产量增加17.2斤,提高59.4％;亩产量增加358斤,提高43.3％;好果率增加52.7％,基本解决了“十桃九烂”问题;而且增强了果实着色,提高了果实整齐度,改善了品质。使每斤售价提高0.43元,每亩喷药投资降低8-10元,每亩净增产值683.46元。  相似文献   

冈优12的组合特性及其高产技术途径的探讨     

李天  田彦华 《四川农业大学学报》1992,10(3):522-526

本文研究了杂交水稻新组合冈优12的组合特性及其高产技术途径。结果是:冈优12具有叶片宽大直立,功能期长,分蘖力中上,成穗率较高,大穗中粒,经济指数高等特性;其库容量大,源流不协调;结实率与产量存在显著相关,着粒数(在163粒以上)与产量存在显著负相关。高产技术途径是在保证足够穗数基础上,减少不实颖花数,提高结实率。  相似文献   

柑桔地膜覆盖效应的研究 Ⅰ.对产量和品质的影响     

曾伟光  刘远鹏 《四川农业大学学报》1991,(1)

本研究发明,在四川盆西北地区,柑桔园春季覆膜,可提高座果率,显著地减少第一次生理落果。秋季覆膜能减少25%的裂果;比对照增产10～27%;改善树冠下部果实品质,果汁中可溶性固形物、总糖含量提高,而总酸和维生素 C 变化不明显。  相似文献   

Kikuyu over-sown with ryegrass and clover: dry matter production,botanical composition and nutritional value     

《African Journal of Range and Forage Science》2013,30(3):93-101

The seasonality of growth and low nutritional value of kikuyu (Pennisetum clandestinum) pasture restrict milk production. The aim of the study was to determine the dry matter yield, botanical composition and nutritional value of irrigated kikuyu over-sown with annual ryegrass (Lolium multiflorum var. westerwoldicum), white clover (Trifolium repens) and red clover (T. pratense) or a mixture of perennial ryegrass (Lolium perenne) with white and red clovers under intensive grazing conditions with dairy cows. The incorporation of annual ryegrass, perennial clover or perennial ryegrass–clover into kikuyu pasture changed the seasonal fodder flow and increased the spring dry matter (DM) production. The over-sowing of kikuyu with annual ryegrass had no effect on the DM production of kikuyu during the summer and autumn. Kikuyu and kikuyu–ryegrass, fertilised with nitrogen fertiliser, had a higher DM production rate than kikuyu–clover pastures. Kikuyu–ryegrass pasture transformed from ryegrass-dominant in spring to kikuyu-dominant in summer and only kikuyu in autumn. This led to a decrease in metabolisable energy (ME) and increase in neutral detergent fibre (NDF) content of the pasture during spring, summer and autumn as kikuyu became more dominant. The clover content of kikuyu over-sown with clover decreased annually but was still higher than 30% at the end of two years after establishment. As the kikuyu content of the kikuyu–clover pastures increased, the seasonal growth rate changed from a low autumn growth (37.9 kg DM ha^?1 d^?1) in the first year to a higher autumn growth (48.5 kg DM ha^?1 d^?1) in the second year. The over-sowing of kikuyu with clover resulted in lower DM production and NDF values and higher crude protein (CP), ME and calcium (Ca) values. The lowest CP content in kikuyu–ryegrass pasture was during summer and autumn when kikuyu was dominant. The Ca content of the grass pastures (kikuyu and kikuyu–ryegrass) was low. The phosphorus (P) content of both the kikuyu–clover and grass pastures exceeded the requirement needed for dairy production (0.38%). The mean Ca:P ratio of the kikuyu–clover pasture meets the 1.6:1 ratio needed by dairy cows. The kikuyu and kikuyu–ryegrass pasture had a Ca:P ratio lower than 1:1 and Ca supplementation would be needed for dairy cows. The incorporation of annual ryegrass, perennial clover or perennial ryegrass–clover into kikuyu pasture improved the seasonal DM production and nutritional value of the pasture.  相似文献   

群体密度对亚种间杂交稻Ⅱ优162产量形成的影响   总被引：1，自引：0，他引：1  

袁继超  陈天福 《四川农业大学学报》1998,16(4)

通过设置９～３６株／ｍ２１０个水平的栽插密度试验,探讨了群体密度对亚种间杂交稻Ⅱ优１６２生长发育与产量形成的影响,结果表明：有效穗数随着栽插密度的增大而增多,穗粒数则相反,产量（Ｙ）与栽插密度（Ｘ）满足Ｙ＝Ｘ３３０６＋５９８６×１０－６×Ｘ１．２２３７２６方程,产量在密度１２～３０株／ｍ２范围内差异不显著,说明亚种间杂交稻Ⅱ优１６２自我调节能力很强;单株分蘖数和成穗率随着群体增大而降低,达到最高苗的时期和有效分蘖终止期随栽插密度增大而提早;抽穗后干物质积累量和ＲＧＲ随密度增大而降低。  相似文献   

小麦异源(黑麦)重组系主要育种目标性状相关研究   总被引：2，自引：1，他引：1  

颜泽洪  郑有良 《四川农业大学学报》1999,17(1):1-4

本文对小麦异源（黑麦）重组系主要育种目标性状间相关的程度与性质进行了分析。结果表明：抽穗期与小穗数、株高与蛋白质含量、千粒重与穗粒重以及穗粒数与穗粒重均呈极显著的正偏相关。千粒重与穗粒数呈极显著的负偏相关。其余性状间相关均不显著。千粒重和穗粒数的负偏相关对小麦异源（黑麦）重组系的遗传改良有重大影响,打破该相关也相当困难。其次,株高与蛋白质含量以及抽穗期与小穗数的正相关关系对选育多小穗和高蛋白质含量有一定的不利影响。文中对千粒重与穗粒数的协调以及与高蛋白质含量的结合问题进行了讨论。  相似文献