我国著名数学家华罗庚说：“科学上没有平坦的大道，真理长河中有无数礁石和险滩，只有不畏攀登的采药者，只有不怕巨浪的弄潮儿，才能登上高峰采得仙草，深入水底觅得骊珠。” 从哲学上讲，这段话包含的唯物辩证法观点是( )。
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There was a difference in 1000-seed weight between the harvest methods and seeds of the direct-harvested canola were larger in size. This may suggest that direct-harvesting can be considered as a viable option to harvest canola in western Canada. 展开 ...
According to the Ministry of Agriculture and Rural Areas [37], more than 4.7 billion tons of agricultural residues have been produced annually in recent years, with 29.87% of available agricultural residues used to generate biogas that is mainly consumed by farmers according to the National 13th ...
Agriculture has always been about adaptation: tweaking practices, nurturing ideal conditions against the year’s odds, and honing in on cultivars that can be coaxed into thriving for a predictable harvest. It’s practicing equal parts ‘planning with foresight’ and ‘embracing what comes’ – and...
This research project examined the relationship between pro-biodiversity attitudes, participation in a voluntary stewardship program, and engagement in biodiversity-friendly farming activities among farmers in Nova Scotia, Canada. This investigation was completed through a quantitative survey measuring ...
Canada produces the largest share of the global supply of canola, so events in this country can have an important effect on prices. Extremely cold or warm temperatures can limit crop production. Also, decisions about how to allocate acreage for crop production can impact prices. ...
Urban agriculture is practiced worldwide, but mainly in high-income countries, especially in the United States, Canada, and Europe, where there is a focus on sociocultural benefits. Although urban agriculture is also present in low-income countries, it is mainly oriented toward market-oriented foo...
Recent studies have highlighted that the yields from organic agriculture are often 19–25% lower than those from conventional agriculture. This productivity gap could lead to greater land consumption, contrary to the objectives of soil conservation and reducing ecological footprints [18]. Another study...
CA Canadian Alliance party (Canada) CA Closest Approach (satellites) CA Controlled Atmosphere CA Catamarca (Argentina province, airline code) CA Circuit Assembly CA Cary Academy (Cary, NC, USA) CA Combat Aircraft CA Chromatic Aberration (lens error) CA Chambre d'Agriculture (French: Chamber of ...