当前温室蔬菜生产的主要问题

<正>寒害。茄果类蔬菜及瓜类越冬栽培易发生,深冬季节,昼夜温差徘徊在零度左右时,瓜果类受寒有一种本能的生存状态,造成向下弯叶卷缩寒害症状。又由于低温、高湿、弱光,幼果和叶片均易感灰霉病。采取多层覆盖保温措施,定植后全     

杏树上咋施沼肥

1.根施沼液可在树盘下漫灌或挖沟深灌,可分别于杏树萌芽前、幼果期、花芽分化期、果实采收后漫灌一次。幼树每株漫灌15—25公斤,初挂果树每株漫灌30—50公斤,盛果期树每株漫灌60—90公斤。挖沟深灌分别于萌芽前和果实采收后进行,在树冠下外围4个不同方位各挖1条宽20—30厘米、深15—20厘米、长80—120厘米的沟,然后将沼液灌入,回土填平压实。     

棚室蔬菜受冻后的补救措施

<正>及时浇水冻害发生后要及时浇水,浇水能增加土壤热容量,稳定地表及棚内空气温度,抑制地温下降,有效减轻和控制冻害发展。浇水量以达到耕层为宜,切忌大水漫灌以免低温高湿导致蔬菜沤根。     

冷凉区旱地甘蓝“一优三保”综合栽培技术

<正>甘蓝适应性强,既耐寒又耐热,在我国北方春、夏、秋均可种植。21世纪初,我国旱地甘蓝种植面积已发展到90万hm2。但甘蓝生产中存在诸多问题,如品种混杂老化,施肥盲目,通常采用平畦栽培,整地时肥料撒施,移栽时大水漫灌,水肥损失严重,产效与水肥利用率极低。尤     

喷灌对水稻光合及生理指标的影响

[目的]为研究在喷灌条件下水稻光合及生理指标的变化.[方法]以水稻品种节3为研究材料,研究不同灌溉方式对水稻叶片光合速率、胞间CO2浓度、蒸腾速率、气孔导度、WUE水分利用效率的影响.[结果]在喷灌、漫灌方式下,水稻叶片光合速率、胞间CO2浓度、蒸腾速率、气孔导度率间差异呈极显著水平,水分利用效率呈不显著水平.[结论]从节水角度来讲,喷灌比常规灌溉具有较明显的优势.     

加快水肥一体化与现代农业对接

<正>今年中央一号文件明确提出加快推进我国农业现代化,作为涉农企业究竟以何为切入点来推进?在我国面临干旱、缺水、缺地问题的形势下,滴灌节水技术推广应用的好坏已经成了能否实现现代农业的关键,既解决了高效利用水的问题,还解决了高效利用肥料的问题,有关部门将"水肥一体化"称为"农业一号技术"并不为过。为此,加快水肥一体化与现代农业对接刻不容缓。     

Determining the Optimum Inflow Rates for Micro-flood Irrigation on the Tukulu Soil

The performance of micro flood irrigation （MFI） under different inflow rates was evaluated on 90 m closed ended furrows in the South African Tukulu soil. A single irrigation was used to characterise the surface and subsurface soil water distribution from the 20, 40, 80 and 160 L/min inflow rates treatments. Neutron access tubes were installed to a depth of 1 m at every 10 m distance interval starting at 5 m from the furrow inlet. Soil water content measurements were taken using the WaterMan neutron water meter. The HYDRUS-2D software was also used to provide insight on irrigated furrows soil water content and subsurface water distribution. The 20 L/min produced a stream flow that could advance up to the 60 m furrow distance. The stream flow from the rest of the inflow rates were able to reach the furrow end with the 180 L/min recording the fastest advance time of 23 min. The 20 L/min and 40 L/min had recession period of less than 7 min while the 80 L/rain and 160 L/min lasted more than an hour. Distribution uniformity （DU） at longer furrow distances was the highest from the 80 L/min and 160 L/min with the 20 L/min and 40 L/min recorded similar performances at shorter distances. The 40 L/rain was one of the smaller inflow rates that recorded the highest DU of 0.96 for the generated average infiltrated depth of the 30 m long furrow and therefore should be adopted for furrow distances of less than 60 m on the Tukulu soil.     

农科110

<正>大棚蔬菜如何防冻保温?加强栽后肥水管理:蔬菜移栽后7 d,用沼气液700~1 000 kg/667 m2或腐熟的人畜粪尿700~1 000 kg/667 m2兑水泼施作提苗肥,促进蔬菜正常生长,提高抗寒防冻能力。及时疏通三沟,防止积水造成蔬菜冻害。增施热性好、透气好肥料:鸡粪是热性肥料,牛粪是透气肥料,增施鸡粪、牛粪,加强蔬菜     

莴笋裂茎产生的原因及其预防措施

<正>莴笋即茎用莴苣,其膨大的肉质茎脆嫩鲜美,深受消费者喜爱。但是,在莴笋栽培过程中,如果管理不当在肉质茎膨大后期,很容易出现裂茎现象,肉质茎纵向裂开,深达茎的中心,裂开部分呈黄褐色,易腐烂,产品品质下降、严重影响其经济效益。一、裂茎产生的原因莴笋裂茎是一种生理性病害,其发病因素主要有以下几方面。1、品种因素。不同品种对裂茎的抗性不同,一般紫叶莴笋比绿叶莴笋易出现裂茎现象。2、肥水供应不均。在栽培过程中,如果肥水     

番茄黄化曲叶病毒病决不容忽视

<正>2014年春季,阜蒙县王府镇棚区有农户说,有几个大棚的番茄得了一种奇怪的病,柿子叶都呈佝偻状,展不开,不结果。于是,我站几名同志前去调查,因2012年在锦州开会时我看过这种病害,当时锦州地区的番茄正在受黄化曲叶病毒病的严重危害。所以确定番茄黄化曲叶病毒病目前已经传入我县境内,成为制约秋春茬番茄棚菜生产中最严重的病害。此病害一旦传播蔓延,损失将无法估计。