منابع مشابه
The ‘Single Till’ and the ‘Dual Till’ Approach to the Price Regulation of Airports
In October 2000 the Civil Aviation Authority (CAA) published a Position Paper on the airport quinquennial reviews 1. The paper confirmed the CAA's intention to " undertake a fundamental review of its approach to the economic regulation of designated airports " and reaffirmed its commitment to the criterion of economic efficiency in assessing trade-offs between its statutory objectives under s.3...
متن کاملOptimizing Strip-Till and No-Till Systems for Corn
Recent developments in biofuel demand and the rapid adoption of modern transgenic hybrids are changing production systems towards more corn after corn, more intensive tillage, higher plant populations, and ever higher crop residue levels at harvest. Meeting society’s needs for food, feed, and fuel from grain corn, and in the future from corn stover, requires continued refinement of tillage syst...
متن کاملtechnical evaluation of direct drill planters (no-till planters) used for wheat planting in khorasan-e razavi province
this study evaluated direct drilling planters used for wheat cultivation in khorasan-e razavi province. a randomized complete block design with three replications was used. the treatments were direct drilling of wheat plants into wheat residue using the following direct planters: (1) sfoggia (13-25), (2) baldan (spd3000), (3) tondar (spd 2500), (4) semeato (shm 11/13). the parameters measured w...
متن کاملPerformance Evaluation of Zero-Till Ferti-Seed Drill in Comparison to Conventional and Reduced Tillage Methods of Wheat Crop on the Same Day
Rice–wheat cropping system is very common in India. It contributes to over 70% of total food grain production in the country with an area of 12 M ha under this cropping system. However, it is estimated that under rice and wheat crops separately the area is 42.31 and 22.98 M ha respectively. Looking to the above facts a study at farmer’s field of Ambedkar Nagar district was under taken to evalua...
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ژورنال
عنوان ژورنال: Nature
سال: 1977
ISSN: 0028-0836,1476-4687
DOI: 10.1038/269751b0