氮磷钾混合肥对锥栗坚果产量和质量的影响

以 5年生锥栗为试树 ,进行土壤穴施氮磷钾混合肥试验 ,研究不同氮磷钾肥配比对锥栗坚果产量和质量的影响。结果表明 ,不同组合处理之间 ,除叶片的蛋白质含量和单株果枝数有显著差异外 ,叶绿素含量、单枝结棚数、单株结棚数、栗棚重、坚果重、出实率、单株棚产量和坚果产量的差异均不大。以穴施 0 .2 0kg尿素、0 .1 0kg钙镁磷和 0 .1 5kg氯化钾的混合肥较经济而有效     

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。     

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.     

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.     

不同肥料用量组合对烤烟产值的效应

选择氦、钾、饼肥作为决策变量，研究其对烤烟产值的影响。采用三因素水平二次回归通用旋转组合设计，获得了3个决策变量（Xi）与目标函数（Ya)相互关系的数学模型。分析其试验因素效应和交互作用，并通过计算机模拟寻优，优选出最佳施肥方案，即纯氮施用量为62.26-75.43kg/hm^2，纯钾施用量为191.91-222.02kg/hm^2，饼肥施用量为77.85-115.98kg/hm^2。     

锌硅肥对强筋小麦产量及品质的影响

增施锌硅肥对小麦有显著的减少小穗退化、降低空秕率作用,达到增加每穗粒数、提高产量的目的。过量增施锌硅肥对强筋小麦蛋白质、湿面筋、赖氨酸等营养品质有一定负效应,不利于强筋小麦营养品质的提高。生产上以施用腐殖酸锌硅肥37.5kg／hm2为宜。     

The influence of scale and the spatial characteristics of landscapes on land-cover mapping using remote sensing

Statistical analyses provide a means for assessing relationships between landscape spatial pattern and errors in the estimates of cover-type proportions as land-cover data are aggregated to coarser scales. Results from a multiple-linear regression model suggest that as patch sizes, variance/mean ratio, and initial proportions of cover types increase, the proportion error moves in a positive direction and is governed by the interaction of the spatial characteristics and the scale of aggregation. However, the standard linear model does not account for the different directions of scale-dependent proportion error since some classes become larger and others become smaller as the scene is aggregated. Addition of indicator variables representing class-type significantly improves the performance by allowing the model to respond differently to different classes. A regression tree model provides a much simpler fit to the complex scaling behavior through an interaction between patch size and aggregation scale. An understanding of the relationships between landscape pattern, scale, and proportion error may advance methods for correcting land-cover area estimates. Such methods could also facilitate high-resolution calibration and validation of coarse-scale remote-sensing-based land-cover mapping algorithms. Ongoing initiatives to produce global land-cover datasets from remote sensing, such as efforts within the IGBP and the EOS MODIS Land-Team, include significant emphasis on high level calibration and validation activities of this nature.     

生物有机肥在苦瓜、豆角栽培上的应用研究

对苦瓜、豆角实施新生力生物有机肥应用效果试验,结果表明:施用新生力生物有机肥能显著提高苦瓜、豆角的产量,与施用进口芬兰复合肥相比,平均每公顷增产苦瓜4639.5kg,增产豆角5568.0kg,增幅分别为15.9%和25.1%;同时又能改善苦瓜、豆角的外观和食用品质,增加土壤有机质和速效养分含量,改良土壤,培肥地力。生产上推广应用新生力生物有机肥,对促进生态农业的建设与发展极具意义。