Introduction
Climatic, economic, political, and social changes in the world as well as in Iran have caused changes in the conditions governing the production and processing of agricultural products, and in some cases have caused conventional methods and technologies to fail to meet the needs of society and producers in the country's agricultural sector. In recent years, the occurrence of drought and the increasing shortage of water resources for agriculture have caused rice cultivation to be banned or face various restrictions in other regions of the country, except in the provinces of Gilan and Mazandaran. In such circumstances, in order to issue permits for planting rice in various regions (except Gilan and Mazandaran), finding methods and technologies that can produce rice with less water consumption has been put on the agenda of the Ministry of Agricultural Jihad. Conventional rice planting method (CRP) includes transplanting in poddled soil with permanent flood irrigation method. This method consumes a lot of water, energy and labor. In recent years, despite the lack of irrigation water and restrictions in most rice-rich areas of the country, the area under rice cultivation has increased due to high economic income. One of the ways to reduce water consumption in rice production is direct sowing of seeds in dry-bed conditions in the main land.

Method
This study was conducted to select a suitable method for rice dirrect seeding in dry-bed condition (RDD) in Khuzestan province in a split plots experiment in the form of randomized complete block design with three replications. Four planting methods include: RDD in flat bed with grain drill machine (P1), RDD on the ridge bed (P2), RDD on the ridge bed with hill-drop seeding (P3), and CRP or control (P4) in terms ofindex Economic, technical, crop yield and water consumption were compared. in all treatments, Champa, Anboury and Aerobic rice cultivars were cultivated. Irrigation method was intermittent in RDD treatments and permanent flooding in control treatment (P4). Seed consumption per hectare of main land in P1 and P2 was 100 kg.ha-1, in P3 it was equal to 5 seeds per hill and For P4 (control) was 40 kg.ha-1. The indicators measured in this study were the time required for planting operations per unit area (including land preparation and planting), field capacity of the seeder, water quantity and productivity, number of sprouted plants per square meter, percentage of seed germination, plant height, number of spikes per square meter, number of grains per spike, harvest index, thousand-grain weight, rice yield, and production costs.

Results
The results of this study showed that there was a significant difference in the time required for the planting operation between the different methods.From the perspective of the field capacity index, although there was a significant difference between the averages of the three dry-land cultivation methods, the difference between the average field capacity of each of them and the conventional transplanting method was extremely large. Statistical analysis of seed germination percentage showed that in terms of this indicator, the difference between the planting methods studied was significant at the one percent level, but the difference between the cultivar levels and the difference in the levels of interaction between cultivar and planting method was not significant. The highest percentage of seed germination, 93%, was obtained in the dry-cultivation method of seed heaping on a ridge. Analysis of variance of the data showed that there was no significant difference in terms of grain yield per unit area between the levels of the independent variables of cultivar type, planting method, and the interaction effect of cultivar and planting method. The results showed that the highest water consumption was related to the transplanting method with an amount of 35220 cubic meters per hectare. Also, the methods of dry tillage, ridge and mounding had the lowest water consumption with 17850 and 17800 cubic meters per hectare, respectively. The water consumption of the dry tillage method was measured at 23140 cubic meters per hectare. The results of the economic evaluation showed that in Khuzestan province, for the production of Champa rice, the method of dry planting on ridges and intermittent irrigation had the highest income-to-cost ratio of 2.47.

Conclusions
Direct dry seeding of rice seeds in the main field instead of the conventional transplanting method reduces water consumption and maintains or increases economic production indicators, reduces the time required for planting, and facilitates the production of this important and strategic crop. For rice production in Khuzestan, using an aerobic variety with the dry-cultivation method of hilling on raised bed was identified as the best option with the highest net economic income, the highest income-to-cost ratio, and the lowest volume of irrigation water. After that, Champa variety dry seeded on by seed drill on raised bed along with intermittent irrigation is recommended. To plant the Anbouri variety, it is recommended to use hilling on raised bed method and intermittent irrigation.

Author Contributions
The manner and extent of the authors' participation in conducting this research are as follows:
First author: Jafar Habibi Asl, which was responsible for implementing the treatments, collecting data, analyzing it, and writing part of the article.
Second author: Elyas Dehghan, which Part of the analysis and writing of the article was with him.


Data Availability Statement
All information and results are presented in the article text.

Ethical Considerations
The authors have observed ethical principles in conducting and publishing this article, and this is confirmed by all of them.