Effect of harvest time of paddy on milled rice yield and broken kernels

V. Ilieva1, N. Markova Ruzdik1*, D. Vulcheva2, Lj. Mihajlov1, M. Ilievski1

1Department for Plant Production, Faculty of Agriculture, “Goce Delchev” University, “Krste Misirkov” bb, 2000 Stip, Republic of North Macedonia
2Institute of Agriculture, 8400 Karnobat, Bulgaria

(Manuscript received 15 August 2019; accepted for publication 28 October 2019)

Abstract. The aim of this study was to determine the optimal harvest time to achieve maximum milled rice yield and quality of white rice in some newly introduced Italian rice varieties grown under agro-ecological conditions in the region of Kocani town, Republic of North Macedonia. During the 2014 and 2015, fourteen rice varieties were cultivated to estimate the milled rice yield and broken kernels from three different harvest times. From each rice variety, samples with moisture content between 20-22% (I variant), 18-20% (II variant) and 16-18% (III variant) were taken. From the third harvest variant the highest percentage of milled rice yield (65.23%) was obtained but also the highest rate of broken kernels (12.79%). From the remaining two harvests, almost identical milled rice yields were received (64.19% from the first variant and 64.33% from the second variant), but in terms of broken kernels, there were significant differences. The optimum moisture content during the harvest in order to obtain maximum yield and quality of milled rice ranged from 18% to 20%. The varieties Arsenal, Sprint and Mirko had the most favorable values for milled rice yield and broken kernels.

Production potential of new triticale varieties grown in the region of Dobrudzha

Abstract. The production potential of the new triticale varieties Kolorit, Accord and Respect were investigated in a three-year field experiment (2009 – 2011) carried out in the trial field of Dobrudzha Agricultural Institute, General Toshevo (DAI). The experiment was designed by the split plot method in 4 replications, the size of the trial plot being 12 m2. The investigation involved four predecessors – oilseed rape, pea, sunflower and maize, and three fertilization norms according to the type of predecessor. The effect of some agronomy factors: the year conditions, the type of predecessor and the norm of fertilization, on the formation of yield, test weight, and 1000 grain weight of the new triticale varieties was analyzed. It was found that the year conditions and the level of mineral fertilization were the decisive factors for the formation of the yield of these varieties. Test weight was influenced to the highest degree by the year conditions and the genotype. The environment was determining for 1000 grain weight, while the genotype and the fertilization norm of mineral fertilization had similar effect. The new genotypes were responsive to fertilization, the tiered increase of the nitrogen fertilization norm leading to analogous higher productivity. During the years of investigation all three varieties gave high yields; varieties Accord and Respect had the highest test weight, and varieties Kolorit and Accord – the fullest grain with the largest size.