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 VOLUME Vol.05 Issue05 2025 

PAGE NO. 37-39 

DOI 10.37547/ajahi/Volume05Issue05-10 

 
 
 
 

Testing and Evaluation of Rice Variety Samples in 

Nurseries in The Conditions of Karakalpakstan 
 

 Kamalov Miyirbek Murat o‘g‘li 

Scientific Production Association of Grain and Rice, Head of the Laboratory of Rice Selection and Seed Production, Uzbekistan 

 

Abillaev Urazbay 

Scientific Production Association of Grain and Rice, Uzbekistan 

 

 Esemuratova Guljamal Qalbayevna 

Assistant at Karakalpakstan Institute of Agriculture and Agrotechnologies, Uzbekistan 

 

 Reypova Gulzira Kannazarovna 

Assistant at Karakalpakstan Institute of Agriculture and Agrotechnologies, Uzbekistan 

 

 

Received: 31 March 2025; Accepted: 29 April 2025; Published: 31 May 2025 

 

Abstract: This study presents a comprehensive and in-depth analysis of rice variety samples Д-53 (Д-82), Д-66 (Д-
154(4-12-2)) in a control nursery plot, providing evaluations and conducting competitive variety testing.   

 

Keywords: Rice, variety, selection, control nursery plot, vegetation. 

 

Introduction: Rice crop ranks first in the world in terms 
of yield and second after wheat in terms of 
consumption. It is the main food source for one-third of 
the world's population and, despite its origin in the 
tropics, is widely grown in temperate regions. With the 
global population increasing every year and the 
amount of agricultural land decreasing, while labor 
costs are rising, it is crucial to introduce innovations in 
agriculture, especially in rice cultivation, by creating 
new varieties adapted to local conditions. 

The Republic of Karakalpakstan is a leading region for 
rice cultivation, with significant potential for large-scale 
sowing. However, due to unfavorable soil and climatic 
conditions, water supply issues, delayed irrigation 
timing, increasing droughts, and factors such as soil 
salinity and extreme heat days, there are various 
obstacles limiting the expansion of rice cultivation. 
These challenges are primarily linked to water supply. 

According to B.Abdullayev, U.Abillayev, S.Jalmenova, 
and D.Turdishev, the current requirements for rice 
varieties in modern rice cultivation have changed 

significantly. For Uzbekistan’s rapidly developing 
agricultural sector, the goal is to create export-oriented 
long-grain rice varieties with valuable economic traits, 
early maturity, and resistance to stress factors [1]. 

D. Utambetov and G. Khojambergenov's experiments 
indicate that seed germination rate and field 
emergence vary from 0.9 to 3.9 grains per m2 and 0.2-
0.7%, respectively. Processing coefficients for rice 
varieties range from 1.32 to 1.42%. According to their 
findings, the early maturing “Guliston” variety matures 
4-7 days earlier than other varieties, yielding 2-9 kg/ha 
more. With water savings, up to 4.5 thousand m3/ha of 
water is achieved. The “Guliston” variety is proposed 
for secondary sowing after winter wheat [2]. 

According to B.Abdullayev and U.Abillayev, the 
Karakalpakstan rice fields are located in a sharply 
continental climate zone with saline desert soils in the 
lower reaches of the Amudarya River. Most irrigated 
lands in northern Karakalpakstan suffer from strong to 
moderate chloride and sulfate salinity. These low-
fertility soils, saline due to shallow groundwater, are 

 

https://doi.org/10.37547/ajahi/Volume05Issue05-10
https://doi.org/10.37547/ajahi/Volume05Issue05-10
https://doi.org/10.37547/ajahi/Volume05Issue05-10
https://doi.org/10.37547/ajahi/Volume05Issue05-10
https://orcid.org/0009-0002-8294-5405
https://orcid.org/0009-0000-2631-7354
https://orcid.org/0009-0004-4592-1521


American Journal Of Agriculture And Horticulture Innovations 38 https://theusajournals.com/index.php/ajahi 

American Journal Of Agriculture And Horticulture Innovations (ISSN: 2771-2559) 
 

 

unsuitable for cotton, wheat, and other crops, with a 
relatively short warm season in spring-autumn. 
Complex natural stress factors, limited irrigation water, 
and especially its late arrival significantly restrict the 
expansion of rice cultivation [3]. 

U.Abillayev emphasizes that in the extremely harsh soil 
and climatic conditions of Karakalpakstan, stress-
tolerant varieties play a crucial role in achieving stable 
rice yields [4]. 

Given global climate change, the requirements for new 
varieties have become extremely complex, placing a 
heavy burden on breeders to consider numerous traits 
and characteristics. 

The factors mentioned above present significant 
obstacles to rice cultivation in Karakalpakstan, which 
breeders must address. These challenges highlight the 
need to develop new varieties well-adapted to local 
harsh conditions and meet the global market’s demand 
for high-yielding varieties. 

Our research aims to identify promising high-yielding 
rice variety samples with positive traits that are 
adapted to local stress conditions by conducting 
thorough evaluations and selecting the most suitable 
ones for use in breeding programs. 

METHODS 

The study was conducted at the experimental fields of 
the “Scientific Production Association of Grain and 

Rice” in Karakalpakstan. 

Observations, measurements, and calculations were 
carried out according to the standard methods of 
A.P.Smetanin [1972] and the Methodological Manual 
for Field Experiments [2007] [5]. The components of 
yield indicators were analyzed in the laboratory, and 
the most productive, low-stemmed, early maturing 
samples were selected. The data obtained were 
analyzed using the dispersion method of B.A.Dospexov. 

RESULTS AND DISCUSSION 

Samples in the control nursery plot were sown in pairs 
(standard) using the standard “Guliston” variety for 
comparison. The samples were analyzed for their 
tillering ability (number of stems) during the seedling 
and full ripening phases. 

The ability of rice plants to produce tillers is a key factor 
influencing growth and yield. The tillering ability of a 
variety reflects its biological adaptation to the local 
environment. We observed significant differences in 
field emergence and survival until full maturity among 
the varieties. 

Through agrobiological evaluation, we identified 
samples with many positive traits, as well as those that 
are resistant to the stress factors of Karakalpakstan and 
capable of full ripening. We paid particular attention to 
their early maturity and performance indicators. 

Table 1 

Classification of the ability of studied rice samples in the control nursery plot to produce tillers and 

their yield characteristics 

 

№  

 

 

 

Variety Sample 

Tillers at Transplanting 

(m²/pcs) 

 

Yield, 

q/ha 

 

Differen

ce from 

Standar

d (q/ha) 

Lodging 

Resistanc

e (score) Seedling 

stage 

Full maturity  

stage 

1 Gulistan st. 220 179 65,4 - 5 

2 Д-21 (Д-7(Д-48)   235 178 69,6 4,2 5 

3 Д-66 (Д-154(4-12-2)  216 172 74,0 8,6 5 

4 Gulistan st. 232 156 66,5 - 5 

5 D-17 (otb. Almaz) 216 170 69,0 2,5 5 

6 Д-13(Д-32(Д-135) 230 194 73,0 6,5 5 

7 Gulistan st. 226 175 68,0 - 5 

8 Д-32 (Д-530) 222 177 73,0 5,0 5 

9 Д-35(Д-105) Д-192) 197 169 76,0 7,0 5 

10 Gulistan st. 212 172 65,8 - 5 

11 Д-53 (Д-82) 198 169 76,0 10,2 5 

12 Д-20 (Д-442(Д-143)  214 179 68,2 2,4 5 

The selected large-grain samples in the control nursery 
plot formed normal tiller numbers and demonstrated 
adaptive traits suitable for local conditions (Table 1). 

Our observations revealed that, during the seedling 
phase, the number of germinated grains ranged from 
197 to 235 compared to the standard “Guliston” 
variety. At full ripening, the tiller numbers ranged from 



American Journal Of Agriculture And Horticulture Innovations 39 https://theusajournals.com/index.php/ajahi 

American Journal Of Agriculture And Horticulture Innovations (ISSN: 2771-2559) 
 

 

156 to 194. In terms of yield, the studied samples 
exceeded the standard “Guliston” variety’s yield of 
65.4-68.0 t/ha, with Д-53 (Д-82) and Д-66 (Д-154(4-12-
2)) showing the highest differences. They also exhibited 
stress resistance and lodging tolerance. The best-
performing samples will undergo competitive variety 
testing next year, with thorough study and evaluation. 

REFERENCES 

Abdullayev B.U., Abillayev U., Jalmenova S., Turdishev 
D.Y. Creation of ultra-early maturing rice varieties 
adapted to the stress factors of Karakalpakstan. 
Proceedings of the International Scientific-Practical 
Conference “Modern methods of cultivation of rice and 
leguminous crops and the prospects for resource-
saving technologies.” Tashkent, August 17-18, 2023. 
pp. 81-85. 

Utambetov D, Khojambergenov G. Selection of rice 
varieties in extreme conditions of Karakalpakstan. 
VISCEA Vienna International Science Conferences and 
Events Association. Transgenic plants & transformation 
technologies, Vienna, Austria, July 6-7, 2022, p.38. 

Abdullaev B, Abillaev U. Specificity of rice breeding in 
Karakalpakstan. VISCEA Vienna International Science 
Conferences and Events Association. Transgenic plants 
& transformation technologies, Vienna, Austria, July 6-
7, 2022, p.37. 

U. Abillayev, B.U. Abdullayev, G.Q. Yesemuratova, A. 
Yesemuratov. Specificity of rice cultivation in water-
deficient and late-irrigated conditions in 
Karakalpakstan. International Scientific and Practical 
Conference “Prospects for the cultivation of high-
yielding and high-quality cereals, legumes, oilseeds, 
and fodder crops resistant to global climate change.” 
May 13, 2022, p.149. 

Methodological manual for field experiments. 
Tashkent, 2007.  


