Yield Of Amaranth Research Articles

EFFECTS OF INTERCROPPING ON FRESH LEAF YIELD OF AMARANTH (A. DUBIUS) IN WESTERN KENYA

ISHS International Symposium on Underutilized Plants for Food Security, Nutrition, Income and Sustainable Development EFFECTS OF INTERCROPPING ON FRESH LEAF YIELD OF AMARANTH (A. DUBIUS) IN WESTERN KENYA

Efeito da adubação nitrogenada na produção de amaranto

This work was carried out to study the effect of nitrogen fertilization on grain amaranth yield, in Maringa, north of Parana state. It was done in field conditions, using a complete randomized design, with four treatments and three replicates. Seeds were sowed in lines, spaced each 0.5 m. Fertilization was done with NPK 10-10-10 (350 kg/ha). Fifteen days after germination there was left a population of 20 plants m -1 . Thirty days after germination fields received nitrogen fertilizer (urea, 45% N), and doses were 0; 50; 100; 200 kg N ha -1 . Plants were cut 114 days after germination, to measure the following parameters: plant height; stem diameter; fresh and dry biomass yield of stems and leaves; and seed yield. Plant height and grain production showed quadratic response. Stem diameter showed no differences. Biomass production (fresh and dry) showed linear response. Yield of amaranth grains answered positively to nitrogen fertilization.

Yield and nitrogen utilization efficiency of the pseudocereals amaranth, quinoa, and buckwheat under differing nitrogen fertilization

In recent years, the cultivation of the pseudocereal species amaranth, quinoa, and buckwheat has gained rising attention. This study was undertaken to explore nitrogen (N) fertility requirements and nitrogen use efficiency of these species. For this purpose, a 2-year field experiment with N rates of 0, 80, and 120 kg N ha −1 for amaranth and quinoa and 0, 30, and 60 kg N ha −1 for buckwheat and two cultivars of each species was conducted. Grain yield of amaranth responded to N and ranged between 1986 and 2767 kg ha −1. Nitrogen utilization efficiency (NUtE) ranged from 13.9 to 15.4 kg grain yield per kg above-ground plant N and decreased with increasing N rate. Higher grain yields and NUtEs seemed to be mainly inhibited by the low harvest index (0.22–0.23) of the investigated amaranth cultivars. Quinoa yielded between 1790 and 3495 kg grain ha −1 and responded strongly to N fertilization. NUtE averaged 22.2 kg kg −1 and did not decrease with increasing N rates. The grain yield of buckwheat did not respond to N fertilization and averaged 1425 kg ha −1. N uptake increased only slightly with N fertilization. NUtE ranged from 16.1 to 20.0 kg kg −1. Main problems occurring with the application of N to buckwheat were grain scattering and lodging.

Nitrogen Fertilizer Effect on Grain Amaranth

AbstractGrain amaranth (Amaranthus spp.) is an ancient crop that is now receiving fresh attention. This has led to a demand for crop management information, including that on N fertilization. This study evaluated the effect of N fertilizer on amaranth grain yield, yield components, and growth and development. The study was carried out in three Missouri environments with five levels of N fertilizer (NH4NO3 broadcast preplant at 0, 45, 90, 135, and 180 kg N ha−1) and three cultivars (Plainsman, D136, and K266). Averaged across cultivars and environments, N fertilizer at the top rate of 180 kg N ha−1 produced a yield increase of 42% relative to plots receiving no N fertilizer. Yields were consistently improved by additions of 45 and 90 kg N ha−1, but additional N fertilizer above the 90 kg N ha−1 rate increased yield in only one out of three environments. At the one site where yield components were evaluated, yield differences were due to increases in seed number per plant, since seed weight and plant population at maturity were unaffected by N fertilizer rate. Plots with high rates of N fertilizer had later maturity, as indicated by time of flowering and seed moisture. Average moisture of seeds harvested from plots receiving 180 kg N ha−1 was 320 g kg−1, while seeds from plots with no N fertilizer had 240 g kg−1 moisture. Comparing the same high‐N treatment to the control with no N showed height increases of 14, 24, and 44% in the three environments. Although amaranth yield is responsive to N fertilization, high rates of N fertilization can negatively affect grain harvest in terms of excessive plant height, increased lodging, and delayed crop maturity.

Intercrop Performance of Pearl Millet, Amaranth, Cowpea, Soybean, and Guar in Response to Planting Pattern and Nitrogen Fertilization

AbstractIntercropping is a common practice in developing countries because it may produce higher total yields than monocropping. The objective of this study was to apply intercropping principles to alternative and traditional crops in the USA under mechanized conditions. Although these crops have been examined in intercropping systems, in most cases studies were not conducted with improved varieties found in the USA or in strip widths that can accommodate machinery. A field study was conducted at two central Missouri locations in 1991 and 1992 to determine the effect of intercropping on grain yields of pearl millet [Pennisetum glaucum (L.) R. Br.], amaranth (Amaranthus hypochondriacus L. × A. hybridus L.), cowpea [Vigna unguiculata (L.) Walp.], guar [Cyamopsis tetragonoloba (L.) Taub.], and soybean [Glycine max (L.) Merrill]. Treatments were assigned in an incomplete factorial design and consisted of planting pattern (monocrops, narrow and wide row strips, and alternate row intercrops), N fertilizer (0, 56, or 112 kg N ha−1), and component crop combination. Each intercrop consisted of a legume (cowpea, soybean, or guar) and a nonlegume (pearl millet or amaranth). In the strip intercrops, only cowpea showed a consistent yield response to planting pattern, with the narrow strip arrangement with amaranth yielding 53 and 39% lower than its monocrop in two environments. Land equivalent ratios of amaranth and pearl millet grown in alternate rows with cowpea were not significantly different from their monocrops. At the Columbia site, yields of alternate row intercrops generally did not increase upon addition of N and in 1992, amaranth yield at 0 kg N ha−1 was 25% higher in the alternate row intercrop than it was at the same N rate in the monocrop. In general, grain yields were similar in the various intercrops compared with monocrops.