| 词汇 | example_english_perennial |
| 释义 | Examples of perennialThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. The plants are tough perennials, less than a metre high. While it may be conducive to bean growth, deep hoeing may be detrimental to bananas or other perennials associated with the trees. Herbaceous perennials with type 1 seed banks should be reintroduced by sowing. In other words, the pressure of disease has not led to the downfall of perennials. If perennials can fix an adequate amount of carbon to make them viable crops, the question becomes one of harvest index rather than trade-off. However, there is a difference in the response for annuals and perennials crops. The project also entails helping local people near the camps to plant perennials such as coffee trees and oil palms. In the dry season the green perennials were tested. Over the same time period, income from perennials remained fairly constant, while income from annual crops fell. Coffee is indicative; policy distortions have affected other perennials in similar ways. Furthermore, in an agricultural setting, the risk of poor establishment-frequently an issue with annual crops-is avoided in the years when perennials are regrowing. The framework also explains how high-seed-yielding herbaceous perennials could be developed through selection, despite their rarity in natural ecosystems. Nutrient resorption from senescing leaves of perennials: are there general patterns? The accumulation of detrimental pathogens in plant rhizospheres can affect both annuals and perennials in natural and agroecosystems. In interpreting this result, one should keep in mind that the area for annual crops is far larger than for perennials. Globally, natural systems, primarily dominated by perennials, had greater mean net primary productivity than the anthropogenic systems that replaced them14. Grazing, unless carefully managed, prevents regrowth of perennials. Plantings of perennials (such as cacao) also contribute to land value. The deforestation results are reversed: technological improvement in annuals and perennials, if not complemented by innovation in livestock, causes major increases in deforestation rates. In contrast, most wild perennials are extremely competitive. We checked a popular online nursery to see what it would cost to buy the garden perennials that emerged from our soil samples. Short-lived species are not abundant in the real vegetation, which is governed by perennials. Most species were perennials and not strongly influenced by drought, virtually no species disappeared from any of the subplots. The production technology being innovated, whether livestock, annuals, or perennials, is a determining factor of the impact innovation has on deforestation. In the wet forest, there was no indication that utilization by annuals and perennials (virtually all species) differed between diameter classes. Beyond this arboretum, on the village outskirts, women worked the less fertile grasslands, where instead of the perennials, they planted annual crops. Each year, different sites were sampled, because scentless chamomile is outcompeted by perennials within one to two years. Higher yielding perennials point the way to new crops. From the perspective of a plant pathologist working on agronomic problems, pathogen build-up seems natural in any plant stand, especially perennials. The resources stored by perennials can enable them to sustain seed production even in stressful conditions52. Seedling emergence had ceased after 3 months, but some perennials were not identified until 2003. How important is seed predation to recruitment in stable populations of long-lived perennials? Seedlings were generally rare all year around; most species were perennials with apparently limited recruitment. The (long) gestation period for perennials would increase the importance of factors such as expectations about future prices and availability of credit. The model then imposes a product-specific yield penalty (similar across soil categories) if soil nutrients available for annuals and perennials fall short of requirements for achieving expected crop yields. Although much research with mixtures focuses on annual grain hosts, we do not expect disease responses within mixtures of perennials to differ from annual mixtures within a single growing season. Given that tests were performed under temperatures reflecting conditions in early or late summer, untreated seeds of most perennials should be able to germinate readily when sufficient moisture becomes available. Wild plants with inherently slow growth rates, such as most perennials, tend toward large investments in antiherbivore defense compared to plants with fast growth rates, such as most annuals35,36. The analysis shows, however, a marked difference in the response for annuals and perennials, with the former offering much higher flexibility. Table 3 reports peak yields for each crop - corresponding to first year for annuals, and third to fifth year for perennials (depending on technology level) - resulting from the participatory assessment. The structure of the contract led to investment by the colono, namely in the construction of terraces and in the planting of perennials such as vines. Comparative plant demography - relative importance of life-cycle components to the finite rate of increase in wood and herbaceous perennials. One might expect a succession in sporocarp production with annuals dominating first, and perennials dominating on more decayed logs, as they need more nutrients to produce a sporocarp. A select body of operas became perennials, but this was still in the face of public indifference, since the seats were filled through ticket distribution in factories or schools. Evolutionary demography of monocarpic perennials. I would like to see it tackled in the way a gardener deals with a bed of perennials that has overgrown. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Most of them wither and disappear soon enough, but there are a few hardy perennials which may serve as examples of their breed. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 There are about 40-60 species, including annuals, perennials, and shrubs. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Progress in breeding perennial clovers for temperate agriculture. The third section is composed of six profiles of perennial polycultures from various locations around the world. Besides reducing erosion, perennial herbaceous legumes may also increase water infiltration in the soil9. The digestibility of the leaves and stems of perennial ryegrass, cocksfoot, timothy, tall fescue, lucerne and sainfoin, as measured by an in vitro procedure. The trade-off of carbon among various functions is avoided if the total pool is increased in the more efficient perennial plant. Plants used for bedding are generally annuals, biennials or tender perennials; succulents are gaining in popularity. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In these books, as well as in more general theorizing, the perennial questions of autobiography theory were debated and re-debated. Indeed, there is evidence that fitness in perennial plants tends to depend more heavily upon survivorship than on fecundity28. Among the plant species employed, perennial herbaceous legumes intercropped with fruit trees present great potential for improving plant production in orchards5,6. Such diseases may pose significant problems for perennial wheat, characterized by low disturbance and stand persistence over multiple growing seasons. Our rediscovery of this perennial philosophy is necessary if we are to develop the wisdom necessary to containing our enormous sc ientif ic capabilities. Indeed, several perennial grain breeding programs have been initiated and are progressing well. Ecologically, the costs of being a perennial are offset by the advantages. A growing number of agricultural scientists seek a way out of this situation through development of perennial grain cropping systems. Rather, perennial grain breeders are pursuing two parallel strategies: domesticating promising wild perennials and hybridizing annual crops with perennial relatives. All recognize that high seed yields are a basic requirement for successful widespread adoption of perennial grain crops. The biennial and perennial crops were mainly used for animal feed or environmental uses, such as soil erosion control, ornamentals or cover crops. Understanding the cropping system as an ecosystem is important, perhaps more so when considering the management of perennial crops. Over time perennials and small trees began to be domesticated including apples and olives. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, lessons from plant ecology suggest that the problems of genetic uniformity may become too great within a perennial cropping system. Thanaka trees are perennials, and a tree must be at least 35 years old before it is considered mature enough to yield good-quality cuttings. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In some species, perennials retain their foliage all year round; these are evergreen perennials. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are generally large evergreen perennials forming clumps of grey-green leaves, with tall flower-spikes to 1.5 m. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Bulbs and perennials were ordered too, including tulips, hyacinths, lilies and gladioli. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Guerrilla gardening continues today, as individuals secretly plant fruit trees, edible perennials, and flowers in parks, along bike trails, etc. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are perennials, surviving the winter in the form of corms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are dense low evergreen mat-forming perennials or subshrubs, with leathery oval leaves 110 cm long. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Brookfoams are glandular rhizomatous creeping perennials with highly lobed or toothed leaves and inflorescences of petite flowers. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. With asexual perennials the best time is just before harvest. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They are herbaceous perennials, usually with bulbs, although in some cases they have short rhizomes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Progress in breeding perennial forage grasses for temperate agriculture. Breeding for perennial species is a time-consuming, laborious task, and the release of suitable cultivars is still perhaps 25 years away. Although strategies have been developed2, plant breeders, working with other scientists, now need to establish and expand perennial grain breeding programs. Repeated harvests of edible seeds from perennial plants, on the other hand, would not require annual selection and replanting. Perennial grain plants should be selected to expend less energy on competition and more on seed production. However, other experiments have indicated the beneficial effects of perennial legumes and no-till agriculture on soil nitrogen. The present study pointed to the critical role of legumes, especially perennial alfalfa, for increasing the energy efficiency of a cropping system. In 2000-2001, our western wheatgrass also contained some volunteer sweet clover, which decreased forage quality and reduced perennial grass yield. Developing high seed yielding perennial polycultures as a mimic of mid-grass prairie. Besides intercropping with fruit trees, perennial herbaceous legumes have also been used successfully as forage plants13,14. In the meantime, germplasm must be continually evaluated for disease resistance, among other agronomic traits, including perennial habit. One perennial area of concern in reading tests is the effect of readers' background knowledge and the text topic on any measure of reading ability. They are ubiquitous in seasonal and perennial wetlands and are easily transportable after drying into cakes. They are succulent perennials with fleshy grey-green leaves often colouring red late in the season. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. What constituted independence in terms of wealth was a perennial theme for the moralists of the court. Symptoms are generally similar among infected legumes, however timing and pattern of disease can differ among hosts and between annuals and perennials. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. On reaching this area of heavier rainfall, the sand wasfixedby the perennial vegetation. The square footage of perennials went from 1500 to 18,000. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In particular, the milk market increased in importance in the total production and income levels of households, while annual and perennial crops declined in importance. On the other hand, those households with higher levels of milk income in 1996, produced more milk and significantly less perennial crops in 2000. She specializes in layering shrubs and perennials with occasional accents of annuals to create the all-season garden. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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