نتایج جستجو برای: keywordsoilseed croppath analysis competition weed

تعداد نتایج: 2903393  

2006
K. Saito B. Linquist B. Keobualapha K. Phanthaboon T. Shiraiwa T. Horie

In northern Laos, rapid population growth and government policies to reduce the area under slash-and-burn systems have resulted in increased cropping intensity, which has increased weed pressure and reduced yields of upland rice. Promising alternative cropping systems include the use of weed-suppressing and multi-purpose legumes as short-term fallow crops. In this study, Stylosanthes guianensis...

2007
L. BASTIAANS D. L. ZHAO N. G. DEN HOLLANDER D. T. BAUMANN H. M. KRUIDHOF M. J. KROPFF

Weed management systems that rely less on chemical control are needed globally. Next to curative chemical weed control, there are other ways of tackling weed problems, such as (a) reduction of the weed seed bank in the soil, (b) reduced recruitment of weed seeds from the soil seed bank, and (c) strengthening the relative competitive ability of the crop. A number of case studies are presented in...

Journal: :بوم شناسی کشاورزی 0

in order to evaluation of seed production index in lambsquarters (chenopodium album), leaf appearance and yield of fennel (foeniculum vulgare) under inter-specific competition a factorial experiment was conducted in islamic azad university, tabriz branch, iran, during 2011-2012. treatments were weed densities of 0, 2, 4, 6 and 8 plants per meter row and its relative emergence times of simultane...

2010

Weed pressure in 1995 was incredible! What happened to produce such a glorious crop of weeds? The answer: drought! The Drought of 1995 and Weeds and Weed Control in 1996 Weed pressure in 1995 was, in a word, incredible! I toured many areas — golf courses, lawns, athletic fields, and institutional grounds — that were solid crabgrass, knotweed, clover, etc. In many of these areas, if there weren’...

2015
Paolo Ruisi Benedetto Frangipane Gaetano Amato Alfonso S. Frenda Antonella Plaia Dario Giambalvo Sergio Saia

Choosing genotypes with a high capacity for taking up nitrogen (N) from the soil and the ability to efficiently compete with weeds for this nutrient is essential to increasing the sustainability of cropping systems that are less dependent on auxiliary inputs. This research aimed to verify whether differences exist in N uptake and N fertilizer recovery capacity among wheat genotypes and, if so, ...

1998
Hector Valenzuela Joe DeFrank

INTRODUCTION The primary limitations of conventional weed control programs include a heavy reliance on capital intensive, toxic, and non-renewable resources (pesticides and petrochemicals) to manage weed competition. Weed emergence from the soil top layers is facilitated by the continuous disturbance created through cultivation, irrigation, pesticide applications, machinery, and other cultural ...

Journal: :Weed Science 2021

Abstract Macronutrient inputs to annual cropping systems can benefit weeds as well crops, sometimes decreasing or eliminating the benefits of fertilization. This interaction between fertility management and integrated weed is becoming increasingly important these fields increase their focus on efficiency prevention, respectively. The risk increased competition reflects fact that biomass height ...

2015
Judith A. Odhiambo Urszula Norton Dennis Ashilenje Emmanuel C. Omondi Jay B. Norton Jose Luis Gonzalez-Andujar

Weed competition is a significant problem in maize (Zea mays, L.) production in Sub-Saharan Africa. Better understanding of weed management and costs in maize intercropped with beans (Phaseolus vulgaris, L.) during transition to conservation agricultural systems is needed. Changes in weed population and maize growth were assessed for a period of three years at Bungoma where crops are grown twic...

Journal: :iran agricultural research 2012
m. rajabian j. asghari s. m. r. ehteshami m. rabiee

in order to determine the responses of morphological characteristics, yield and yield components of rapeseed (brassica napus l.) to plant density and weed interference duration, a factorial experiment was conducted using a randomized complete block design with 3 replications at the rice research institute of iran (rrii) in rasht, in the 2008 growing season. the factors comprised plant density a...

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