玉米专用肥的农用效应

1991年在全省三个玉米产区进行了玉米专用肥田间试验,结果表明:山西省各地区褐土类型土壤上施用玉米专用肥效果好,亩施有效养分10公斤,增产玉米90～150公斤,效果显著,可得纯收入20～50元,经济效益明显。     

绿欣有机复合肥在水稻上应用效果试验

水稻移栽后施用绿欣有机复合肥40kg/667m2,植株分蘖早、分蘖多,后期表现好,纹枯病比施红中复合肥的少;增加有效穗数30穗/667m2,增产50kg/667m2。在施用中避免与种子、肥料直接接触;在避光通风、干燥处存放,严禁与粮食、饲料混存混运;建议扩大示范,加快推广。     

控释氮肥对莴苣生长及氮肥利用率的影响

采用盆栽和田间试验,探讨了控释氮肥脲甲醛(UF)不同供氮水平条件下的肥料效应;并采用微区试验比较了控释氮肥与其他速效氮肥品种对莴苣生长,形态指标,产量及利用率的影响。结果表明,控释氮肥的供量与产量密切相关,中氮水平处理,肥效最佳,过量供应,单位肥料的肥效明显下降。等氮量条件下,莴苣对控释氮肥的吸收利用率最高,达40.10%,较其它氮肥品种其利用率增加6.93%～31.04%,控释氮肥处理,莴苣的生长指标及增产效应优于其他氮肥品种,不同氮肥品种的增产顺序为UF>CO(NH2)2>NH4NO3>NH4HCO3。     

Influence of Oil Seed Rape and Faba Bean as Green Manure on Nitrogen Utilization in a Spring Cereal Rotation

A lysimeter study was conducted to investigate how nitrogen uptake of spring wheat and oats and N leaching losses are differing when either oilseed rape or faba bean are grown as green manure. The experiment was conducted during 1982–1988, and fertilizer applied to the cereals was either farmyard manure, FYM, (6 and 12 g N/m²/year) or mineral fertilizer, MiF, at a rate of 6 g N/m². On average of the 7 year period faba bean increased N uptake of the cereals fertilized with FYM at harvest by 3–4 g/m². Differences between the two application rates were negligible. N-leaching losses increased twofold when faba bean was grown instead of oilseed rape. Growing faba bean after cereals supplied with MiF, too, increased N uptake of the cereals and significantly increased leaching losses.     

青海云杉移植苗不同施肥方法生长效益分析

通过不同施肥方法试验,研究有机肥、化肥及有机肥与化肥配施对青海云杉移植苗生长的影响。结果表明,施用化肥、有机肥均能促进青海云杉移植苗生长,而有机肥与N、P、K肥配施,才能获得更高的生长量。     

水稻施用缓释尿素免追肥试验、示范初报

在盘山县对水稻进行缓释尿素和磷、钾肥做基肥一次施入免追肥试验和示范研究,结果表明,缓释尿素可提供水稻整个生育期的氮素供应,该施肥法可确保水稻产量,省工省事,可以大面积推广应用。     

绿色优质稻谷栽培技术研究

为生产绿色优质稻谷,从筛选优质高产品种、改用肥料种类和高效低毒农药或生物农药方面进行技术探讨。通过1a的实践表明,在选择优质品种的基础上配备有机肥、生物肥、生物菌肥和生物农药,可生产出绿色优质稻谷。     

Sea salmon sludge as fertilizer: effects on a volcanic soil and annual ryegrass yield and quality

Abstract. To evaluate the effect of sea salmon sludge on soil and ryegrass yield and quality, five treatments were tested (30, 60 and 90 t ha⁻¹ of sludge, inorganic fertilizer and control). The sludge contained 16% dry matter (DM), 0.13% total N and 1.6% P. The sludge increased ryegrass DM yield, P and Na content, but decreased K concentrations in soil and plants. Sludge can be applied successfully on to land, but its addition should be complemented with inorganic nutrients (N, K). The high Na content of the sludge may limit repeated application, but the main benefit is its P content.     

春小麦品质性状对不同密度、N肥反应的研究

试验使用裂区设计研究了14个稳定的春小麦品种（系）的5个品质性状（麦谷蛋白大聚合体、伯尔辛克值、沉降值、粗蛋白含量、湿面筋）对密度、施氮量的反应，发现施氮量是决定5个品质性状的主要环境因子，对施氮量敏感性从大到小依次为麦谷蛋白大聚合体、蛋白质、湿面筋含量、沉降值、伯尔辛克值。     

The concentration of ionized magnesium in serum during the periparturient period of non-paretic dairy cows

Ion-selective electrodes have recently been designed for determining the ionized concentration of magnesium (Mg²⁺) in serum. This development may allow new insights into some metabolic diseases of cattle. For this report, the concentrations of Mg²⁺, total magnesium (Mg_tot), ionized calcium (Ca²⁺), total calcium (Ca_tot), and inorganic phosphate (P_i) were determined in sera from seventeen 3-to 16-year-old Brown Swiss and crossed Simmental/Red Holstein cows during the periparturient period. In each animal, a transient increase of Mg²⁺ and Mg_tot serum concentrations was observed in association with the transient decrease in serum concentrations of Ca²⁺, Ca_tot and P_i after parturition. On average, throughout the study, the serum Mg²⁺ concentrations were 68.5% of those of Mg_tot, whereas the serum Ca²⁺ concentrations were 52% of those of Ca_tot. The possible mechanisms involved in the transient increase of Mg²⁺ and Mg_tot serum concentrations are discussed.Abbreviations Ca²⁺ ionized calcium - Ca_tot total calcium - Mg²⁺ ionized magnesium - Mg_tot total magnesium - P_i inorganic phosphate - PTH parathyroid hormone - PTHrP parathyroid homrone related protein