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Title: Effect of planting pattern and season on some agronomic performances and yield of sweet potato cv. Japanese Orange

item BUNPHAN, DARIKA - Mahasarakham University
item Anderson, William - Bill

Submitted to: Australian Journal of Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/30/2019
Publication Date: 7/1/2019
Citation: Bunphan, D., Anderson, W.F. 2019. Effect of planting pattern and season on some agronomic performances and yield of sweet potato cv. Japanese Orange. Australian Journal of Crop Science. 13(07):1067-1073.

Interpretive Summary: Sweet potato is an important staple crop in many parts of the world. It is often grown as a second crop in Thailand and other parts of Asia. The first crops such as rice and peanut are grown during the wet season. After the harvest of these crops and during the dry season, sweet potatoes can be planted. There are several methods available in planting sweet potato, but it is not clear which one would be best in Thailand for planting during the wet or dry season. The objective of this study was to test five planting methods, that include one, two or three vine cuttings (slips) per hole and at different angles. During the rainy season the three-slip method produced the greatest yield and number of tubers per plant. This method along with two other methods, that required only one slip per hole, had the highest yields during the dry season. From this study, it is recommended to use the three-slip method during the rainy season and either vertical one-slip or the horizontal one-slip method during the dry season to conserve costs at planting. Growers in Thailand and other Asian locations can use this information for determining the best production methods of sweet potato.

Technical Abstract: Sweet potato (Ipomoea batatas (L.) is one of the most important root crops in the world. It is primarily grown as a second crop during the dry season in Thailand. Several cultivars are produced with some being imported from Japan, especially cv. Japanese Orange, Yellow and Purple which are popular because they have high value and are rich in phytochemicals. Thai farmers use only one planting pattern for production although there are five recommended patterns available. The objectives of this study were to investigate the effect of different planting patterns on yield, agronomic traits, and determine associations among agronomic traits of sweet potato cv. Japanese Orange. The experiments were conducted during the rainy and dry seasons of 2017. An RCBD with 5 planting patterns and 3 replications were used. Tuber yield, no. of tuber/plant, no. of tuber/ha, no. branch/plant, tuber diameter and tuber fresh weight were measured. The results revealed that during the rainy season, pattern 5 (three vines per hole) had highest tuber yield (11.7 ton/ha), no. of tubers/plant (7.7) and number of tubers/ha (408.9×103) whereas pattern 3 (one vine) had highest no of branches/plant (4.7) and tuber diameter (36.9 mm). In the dry season, patterns 1, 5 and 3 had the highest yields (7.13, 6.71 and 6.48 ton/ha, respectively) pattern 1 had significantly higher tuber fresh weight (84.17 g) than the other four patterns. Pattern 5 had the highest number of tubers/plant and number of tubers/ha during the dry season. We found positive correlations between tuber yield and number of tuber per plant, number of tuber per ha, vine length, vine girth, number of nodes per plant at 60 and 75 DAP.