The recently discovered ammonia-oxidizing archaea (AOA) have been suggested as contributors to the first step of nitrification in terrestrial ecosystems, a role that was previously assigned exclusively to ammonia-oxidizing bacteria (AOB). The current study assessed the effects of agricultural management, specifically amendment of soil with biosolids or synthetic fertilizer, on nitrification rat...

BACKGROUND TEK, ecological and economic aspects of columnar cacti were studied in the Tehuacán Valley, Mexico to design sustainable regimes of fruit harvest. We analysed the amounts of edible fruit, seeds and flowers produced per hectare of cardonal, jiotillal and tetechera forests, their economic value and actual extraction rates, hypothesizing that the economic benefits of these NTFP would po...

Cupressus sempervirence var. horzontalis belong to the Cupressus family. This species is evergreen and grows within an elevation range of 290 meters and 1200 meters above sea level in the North of Iran. The extraction of texture features from high-resolution remote sensing imagery provides a complementary source of data for those applications in which the spectral information is not sufficient ...

This essay assesses the relationship between farm size and productivity. Both parametric and nonparametric methods are used to derive efficiency measures. Smaller farms are found to have higher net farm income per hectare, and to be more technically efficient, than larger farms. JEL Classifications: Q12, O12

in the recent years, increasing of green house gases, degradation of environment, deforestation alongside with the limitation and decreasing of ecological foot print of the earth for supplementation of human needs are the main problems of the world. the carbon dioxide gas as a main factor of world climate change, carry out the 60 percent of the global heating or greenhouse effect. the main sour...

This study aimed to compare the performance of mint in two modified Nutrient film technique (NFT) hydroponic systems viz., Horizontal ( S1 ) and Vertical A types (S2 along with three nutrient combinations viz.,T1-NPK@ 40:65:40/hectare,T2-NPK @ 50:75:50/hectare,T3-NPK 60:85:60/hectare. The trail was laid out Factorial Randomized Block Design (FRBD) replication at Department Vegetable Science Tam...

An experiment to study the feasibility of intercropping the short duration agronomical crops in periwinkle was conducted at Nagarjun Medicinal Plants Garden, P.K.V. Akola during 1988 - 89, 89 - 90 and 90 - 91. The highest monetary return of Rs. 15,604/ per hectare was obtained from an intercropping system of periwinkle and groundnut is row proportion of 2:1.

this experiment was carried out at agricultural research station of gorgan during summer 2006 to study the effects of corn and green gram intercropping on forage yield, and weed biomass. the experimental design was rcbd with twelve treatments and four replications. a local green gram and corn single cross 550 were the crops employed. the experimental treatments consisted of sole corn and sole g...

Growth elements and stand structure of an artificially established Norway spruce were presented at age 37 62-yr on the basis a single permanent sample plot their changes analyzed. The was with 4500 seedlings per hectare. At 37-yr plot, 2600 trees hectare recorded basal area 43.52 m2?ha?1 standing volume 319,97 m3?ha?1. 62-yr, 878 42.61 454,48 First selective thinning, conducted mean aspirant?s ...