Potato is an important food security and cash crop in eastern Hararghe Zone. However, the productivity of the crop is constrained by low soil fertility and poor fertilizer management practices. Therefore, a field experiment was conducted at Haramaya watershed in Haramaya District, Eastern Ethiopia; during the 2014 off season using irrigation. The main objective of the study was to assess the effects of integrated nutrient management on potato growth, yield and yield components. The treatments were three rates of farmyard manure (0, 5, 10, t ha −1), three rates of N (0, 55.5, 111 kg N ha −1), and three rates of phosphorus (0, 46, 92 kg P 2 O 5 ha −1). The experiment was laid out as a randomized complete block design in (RCBD) in a factorial arrangement with three replications. The results showed that the effect of integrated use of organic and inorganic fertilizer had significant influence on plant height, above ground biomass, day to maturity, total tuber yield, average tuber number/hill, average tuber mass/hill, marketable tuber number and tuber dry matter yield. The highest marketable tuber yields of 38.65 t ha −1 followed by 36.24 t ha −1 were obtained in response to a combined application of farm yard manure, N and P at the rates of 10 t FYM ha −1 + 111 kg N ha −1 + 92 kg P 2 O 5 ha −1 and 10 ton FYM ha −1 + 111 kg N ha −1 + 46 kg P 2 O 5 ha −1 , respectively. The marketable and total tuber yields were positively and significantly correlated with all growth and yield components studied but negatively and significantly correlated with the number of main stem/hill, unmarketable tuber yield. In conclusion, application of farm yard manure with, N and P not only significantly improved prod-How to cite this paper: Mohammed, A., Mohammed, M., Dechasa, N. and Abduselam, F. (2018) Effects of Integrated Nutrient Management on Potato (Solanum tuberosum L.) Growth, Yield and Yield Components at Haramaya Watershed, Eastern Ethiopia.
The experiment was carried out at the second research station, College of Agriculture, Al-Muthanna University during the winter season 2018-2019, to investigate the performance of four wheat cultivars namely Rasheed, IBA99, Bhooth and Abu Graib subjected K+ supplants to antagonize Na+ effect on growth, yield and genome of four wheat cultivars. Subsequently, varying irrigation water qualities were applied, namely Euphrates river water of 2.4 ds.m-1 electrical conductivity (EC), river water + 400 ppm of K+, saline water of 5 ds.m-1EC, and saline water+ 400 ppm of K+. The results revealed the superiority of K+ addition to river and salty water through irrigation substantially antagonized Na+ adversity. Where K+ improved the performance of river water and salty water in plant height (70.71and 72.25 cm, respectively) and leaf area (28.29, and 24.41cm2, respectively) as they compared to river water without K+ (63.83 cm and 21.87 cm2, respectively). IBA99 wheat cultivars showed superiority over others, since it gave the highest plant height (70.375 cm), 1000 seed weights (32.583 g) and grain number per spike (55.475), then comes in the second order Rasheed, as it gave the higher values in plant height (74.41 cm), 1000 seed weight (33.33 g), and spike length (14.816 cm), as compared to Bhooth and Abu Graib cultivars. Then Abu Graib comes in the third order, followed by the worst Bhooth cultivar. Rasheed X + river water + k+was the most potent dual combination, since it showed the highest plant height (78.66 cm), leaf area (35.05 cm2. - 1), and weight of 1000 grain reached (37.33 g). IBA99 + salt water + k+ combination manifested superiority in the grains number of spike which gave 61.36 g. Molecular analysis results in agreement with the those of the morphological analysis by the appearance of TaHKT2;2 gene bands very clear in the Rasheed cultivar, the DNA size of the gene reached 500 nucleotides. Indicating the clear genetic expression of the gene in the varieties (except Abu Graib), especially for the Rasheed cultivar with a combination (Rasheed with salt water + K+), and the positive role played by potassium ion in reducing the harmful effect of sodium ions, Rasheed in the breeding programs of wheat crop to the salt stress tolerance through the hybridization because of its superiority over the rest of the local varieties.
These experiments were conducted in two different sites to study the genetic variability and the mean performance of the elite different origin maize genotypes under irrigated condition in central region of Sudan during rainy season of 2015. The experiments were arranged in randomized complete block design with three replicates, the data were collected on days to 50% tasseling and silking, plant and ear height, ear length and diameter and grain yield. The analysis of variance for each site and cross sites showed a significant variability among tested genotypes for grain yield, days to 50% tasseling and silking, plant and ear height, ear length and diameter. Also significant differences were observed for genotypes, site and a cross site for most of the studied traits such as for grain yield, days to 50% tasseling and silking, plant and ear height, ear length and diameter. The combined results for genotypic coefficients of variability and broad sense heritability estimates grain yield, ear length and ear diameter varied significantly among the tested genotypes.
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