Trypsin digestion of demembranated fowl spermatozoa caused a longitudinal splitting of the distal part of the axoneme. The resulting strands, consisting of groups of doublet microtubules, formed left-handed helices. On the evidence of electron micrographs, the digestion had caused the loss of dynein arms from the outer row; it is assumed that the doublets remained linked together by dynein arms...

Mixed cropping, also known as inter-cropping, polyculture, or co-cultivation, is a type of plant production system that involves planting two more species (or cultivars) simultaneously in the same field variable order (row rowless) [...]

This work aimed to evaluate the variability in distribution of root system among genotypes C. canephora cv. Conilon and indicate management strategies for a more efficient mineral fertilization. Root was evaluated six genotypes. The experimental design randomized blocks with three replications. Soil monoliths measuring about 27 cm3 were collected at different soil depths, row distances nine int...

Twin-row ridge cultivation is widely used in soybean planting northern China. In order to find the optimal parameters of agronomy, twin-row planter with subsoiling was designed. Field experiments were conducted evaluate effects plant arrangements and cluster densities on growth grain yield under different tillage treatments. The experiment a randomised complete block design consisting 20 treatm...

abstract- a real-time, site-specific, machine-vision based, inter-row patch herbicide application system was developed and evaluated. the image resolution was 640 × 480 pixels covering a total area of 350 mm x 240 mm of a field composed of four quadrants of 350 mm x 60 mm each. the image frames were processed by labview® and matlab®. the developed algorithm, based on weed coverage ratio and seg...

Maize is the most represented grain crop on world’s arable land. It mostly grown using standard sowing at an inter-row distance of 70 cm. However, growing in two rows (double-row sowing) increasingly common today. The aim this research was to determine influence different spatial distributions same population maize plants yield grains a larger range FAO hybrid maturing group. experiment lasted ...

The objective was to evaluate the epicotyl length of seedlings soybean cultivars in field, submitted plant densification by reducing inter-row spacing. Two field experiments were conducted Rio Paranaíba state Minas Gerais and effect reduced spacing (20 cm, 30 40 cm 50 between rows) evaluated. assessment done using a millimeter ruler when plants reached V2 development stage. randomized block des...