نتایج جستجو برای: leave total crop residues

تعداد نتایج: 968364  

2016
Alena Bičáková

There are considerable differences in gender unemployment gaps across the EU. We use labor force survey data on 21 countries to perform a series of data decompositions and show that the cross-country variation in gender unemployment gaps is primarily driven by the differences in female labor force participation behavior after childbirth, namely, the family leave duration and the subsequent atta...

Journal: :AJS; American journal of sociology 2010
Jennifer L Hook

National context may influence sex segregation of household tasks through both pragmatic decision making and the normative context in which decision making is embedded. This study utilizes 36 time use surveys from 19 countries (spanning 1965-2003) combined with original national-level data in multilevel models to examine household task segregation. Analyses reveal that men do less and women do ...

2002
ROBERT A. METZGER MARTIN I. HOFFERT Frederick Reines

We argue that sequestering of carbon waste is inherently more efficient and will probably cost less than using the carbon for biomass burning. The ratio of carbon emitted per unit of primary energy released through combustion, C/E, favors sequestration for fundamental reasons of chemistry and engineering, strongly suggesting a low C/E strategy. This is a more direct way of analysis than assigni...

Journal: :Agriculture 2021

Crop residues management has great effects on weeds in croplands. To understand the weed responses to crop and impact yield, a field trial with three strategies been conducted North China Plain since 2008. Weed community composition structure across species, morphological types, life forms, levels were investigated during 2019–2020. The results show that retention significantly decreased densit...

Journal: :The Journal of Agriculture of the University of Puerto Rico 1969

Journal: :Environmental Monitoring and Assessment 2015

2002

From the earliest days, mankind has had to compete with insects for its food supply. In addition, many insects propagated diseases such as malaria, or the bubonic plague which have killed millions of people throughout history. Thus, when modern insecticides were introduced in the early 1940s, they had a tremendous impact both on the world food supply and the general health of people. For instan...

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