施肥对核桃楸床播育苗的影响

[目的]研究施肥对核桃楸床播育苗的影响,达到培育优质壮苗的目的。[方法]研究不同施肥种类及施肥量对核桃楸苗木的茎干、根系生长等特性的影响。[结果]当施尿素15 g/m2+磷酸二氢钾15 g/m2时,苗木在苗高、地径、主根长、侧根数等指标均高于不施肥和其他施肥处理,有利于优质壮苗的培育。[结论]在生长季以施尿素15 g/m2+磷酸二氢钾15 g/m2或磷钾复合肥时,苗木的整体质量最优。     

喀斯特温凉气候区菜用板蓝根播种期试验

[目的]确定适宜的菜用板蓝根播种期。[方法]在喀斯特温凉气候区对菜用板蓝根进行5个不同播种期试验,探索菜用板蓝根的最佳播种期。[结果]在毕节市种植的菜用板蓝根鲜叶产量以4月30日播种的最高,显著高于其他各播种期（P〈0．05）,播期提前或延后都会导致菜用板蓝根鲜叶产量的显著降低（P〈0．05）。[结论]综合菜用板蓝根生长及鲜叶产量分析,毕节市种植菜用板蓝根最适播种期在4月下旬。     

柏木播种与嫁接育苗技术

总结了近年来柏木播种与嫁接育苗技术研究。采用播种育苗方式培育苗木,技术简单,成本低,适宜于大山造林;但实生苗开花结实晚,不能尽快满足森林工程造林用种需求,开展柏木嫁接育苗可提早开花结实年龄,为柏木良种选育提供性状稳定的育种材料。     

地力水平和播期对冬小麦籽粒产量及氮素利用率的影响

以泰农18为试材,在播种密度(基本苗)405.0万株/hm2条件下,研究两个不同地力水平和适度早播(10月1日)、适播(10月8日)和适度晚播(10月15日)对冬小麦籽粒产量和氮素利用率的影响。结果表明:高地力水平下小麦籽粒产量较高但氮素利用率偏低;同地力条件下,适当推迟播期,通过协调单位面积穗数和穗粒数,仍可维持与早播和适播条件下相当水平的籽粒产量;虽然推迟播期降低冬小麦氮素吸收效率,但可提高氮素利用效率,两者互补,所以适当推迟播期氮素利用率仍可维持与早播和适播相当的水平。因此,在不同地力水平下,适当推迟播期可以调控冬小麦冬前群体免受冷害和寒害的影响,维持较高的籽粒产量和氮素利用率。     

Modelling phenological and agronomic adaptation options for narrow-leafed lupins in the southern grainbelt of Western Australia

Australian modern narrow-leafed lupin (Lupinus angustifolius L.) cultivars tend to flower early and are vernalisation-unresponsive (VU). Cultivars have generally been selected for the warmer climates zones and sandy soils of the northern grain belt of Western Australia (NWA), where lupins are predominantly grown. In areas where climates are cooler and growing seasons are longer and wetter, such as the southern grain belt of Western Australia (SWA), it is probable that lupin would have a higher yield potential. Given that VU cultivars would have a longer vegetative phase (i.e. late flowering) we hypothesise that they may be more productive than those that are early flowering. Here we used a modelling approach to: 1) test the hypothesis that cool-climate SWA would have higher lupin yield than warm-climate NWA; 2) explore lupin phenological adaptation and yield potential in SWA over a range of proposed VU cultivars; and 3) further evaluate the combined effects of cultivar phenology, sowing time and seasonal type on lupin yields.Simulations from the Agricultural Production Systems Simulator (APSIM) showed that, on average, lupin yield in SWA was higher than that in NWA, with 23% greater yield for the early-flowering cultivar Mandelup. Proposed cultivars flowering 22 days (late-flowering) and 15 days (medium flowering) later than Mandelup would have their phenology better adapted in the high and medium rainfall zones of SWA, producing 16 and 7% more grain in the two rainfall zones, respectively. The proposed late-flowering cultivar sown before the end of April achieved higher yields for all seasons in the high rainfall zone and for above average and average rainfall seasons in the medium rainfall zone. In more water-limited situations early sowing was preferable with no obvious difference in yield among cultivars. Despite this, the early-flowering cultivar yielded more when sown in late April. The results indicate that lupin production would benefit from breeding VU varieties with a long vegetative phase for the SWA that should be sown in mid to late April.     

夏芋丰产栽培技术研究

研究了３种种植密度、２种播种时期和２种地膜覆盖方式对早熟芋生产发育和夏收产量的影响。地膜覆盖与否是影响芋生长和丰产的关键因素，地膜覆盖比露比栽培增产９０．０９％，栽植密度是影响夏收单产的重要因素；播时期对生长发育和产量无影响。从综合因素考虑，要使夏芋丰产，应适时播种，及早覆盖地膜，密度为２３００株／６６７ｍ＾２。     

河西绿洲区加工型胡萝卜不同密度对产量及加工品质的影响

对河西绿洲地区加工型胡萝卜栽培密度进行了研究,结果表明,种植密度对加工型胡萝卜产量、商品性影响很大,对产量构成因子根重、根径影响较为显著,对根长影响不大.综合评判,试验区加工型胡萝卜栽培最佳密度为保苗37.05万株/hm2.     

不同播期、种植密度及整枝方式对黄秋葵产量的影响

为在甘肃庆阳地区推广种植黄秋葵,在塑料大棚内进行了4个播期(A)、2个种植密度(B)、2种整枝方式(C)对黄秋葵生长及产量影响的试验。试验结果表明,影响黄秋葵产量的关键因素是播期,其次是种植密度,整枝方式对产量影响不大,最优组合是A2B1C2,即播期3月30日、株行距30 cm×50 cm、不整枝,以及A1B1C1,即播期3月15日、株行距30 cm×50 cm、单秆整枝。     

高淀粉玉米郑单18播期试验研究

在河南驻马店市对高淀粉玉米品种郑单18分6个不同播期进行播种试验，通过对不同播期间的生育期、株高、干物质积累、主要经济性状、产量分析比较，初步得出该品种在豫南地区的适宜播期为5月26日~6月20日，为该品种在豫南的高产栽培及大面积推广应用提供了一些科学依据。     

播种期和品种对萝卜现蕾、抽薹和开花的影响

对冬性强弱不同的4个萝卜品种进行周年播种，以探讨其现蕾、抽薹和开花的响应。结果表明，从播种至现蕾、抽薹和开花所需的时间不仅品种间和播种期之间存在显著差异，而正品种与播种期之间的互作效应也达到极显著水平。播种后现蕾、抽薹时间越短，现蕾时叶片数也越少、初花期植株越矮小。在杭州的气候条件下，“白玉春”和“早春大根”周年播种在现蕾前均能够获得正常或基本正常的肉质根，但尽可能避免11月下旬至2月下旬；“一点红”只要在4月至11月初播种亦可在现蕾、抽薹前获得大小正常的肉质根；“短叶13”只有在6月下旬至9月下旬播种时方能在现蕾、抽薹前获得大小正常的肉质根。