scholarly journals Stduies on the Dry Matter Production of Sweet Potato : XI. The effect of deep placement of mineral nutrient on the tuber-yield of sweet potato

1968 ◽  
Vol 37 (2) ◽  
pp. 273-279 ◽  
Author(s):  
Yukindo TSUNO ◽  
Kazuma FUJISE
Keyword(s):  
Sweet Potato ◽  
Dry Matter ◽  
Tuber Yield ◽  
Dry Matter Production ◽  
Mineral Nutrient ◽  
Deep Placement ◽  
Matter Production

Comparative Patterns of Dry Matter Production in Bushy and Spreading Sweet Potato Cultivars

1989 ◽  
Vol 25 (2) ◽  
pp. 243-247 ◽  
Author(s):  
J. R. Pardales ◽  
D. V. Belmonte
Keyword(s):  
Sweet Potato ◽  
Dry Matter ◽  
Dry Weight ◽  
Potato Cultivars ◽  
Dry Matter Production ◽  
Dry Matter Partitioning ◽  
Stages Of Growth ◽  
Matter Production ◽  
Tuber Dry Matter ◽  
Plant Components

SUMMARYDry matter production in a bushy and spreading cultivar of sweet potato was studied in two trials comparing dry matter partitioning between plant components. The bushy cultivar, VSP-2, accumulated more tuber dry matter than the spreading cultivar, BNAS-51. The number and yield of tubers of VSP-2, was also greater but its foliage dry weight was less than that of BNAS-51. The vine and root dry weight of BNAS-51 increased with time but that of VSP-2 reached a peak about 10–12 weeks after planting. The tuber dry weight of BNAS-51 at harvest was similar to its foliage dry weight but that of VSP-2 was three times greater. The proportion of total dry matter partitioned to the tubers of VSP-2 was greater than that in BNAS-51 at all stages of growth.

EFFECTS OF WATER AVAILABILITY AND VINE HARVESTING FREQUENCY ON THE PRODUCTIVITY OF SWEET POTATO IN SOUTHERN MOZAMBIQUE. IV. RADIATION INTERCEPTION, DRY MATTER PRODUCTION AND PARTITIONING

2005 ◽  
Vol 41 (1) ◽  
pp. 93-108 ◽  
Author(s):  
F. GOMES ◽  
M. K. V. CARR ◽  
G. R. SQUIRE
Keyword(s):  
Leaf Area ◽  
Sweet Potato ◽  
Water Availability ◽  
Harvest Index ◽  
Dry Matter ◽  
Dry Season ◽  
Dry Matter Production ◽  
Storage Roots ◽  
Radiation Interception ◽  
Matter Production

In Mozambique, the sweet potato (Ipomoea batatas) is grown both as a leafy vegetable, the terminal shoots or vines being progressively harvested during the season, and as a root crop. It is produced in the dry season, in areas with a high water table or with irrigation, and in the rainy season. This paper reports the results of measurements made during the 1995 dry season to evaluate the effects of water availability and the frequency of vine harvesting on the processes of radiation interception, dry matter production and partitioning. An irrigated crop (cv. TIS 2534) with a single, end of season vine-harvest (H1) intercepted 71% of the total solar radiation, reducing to 52% with weekly (H4) harvests. The corresponding values for a rain-fed crop were 33 and 20% respectively. When the leaf area index (L) exceeded 3–4, virtually full interception of photosynthetically active radiation (PAR) occurred, except when frequent vine-harvests modified the architecture of the leaf canopy. The extinction coefficient (k, PAR) was highly variable: at a given leaf area, interception was greatest earlier in the season, with infrequent harvests and with irrigation. Total dry matter production (vines, foliage and storage roots), over a period of 161 days, reached 23 t ha−1 in the single harvest (H1), irrigated crop, less when the vines were harvested weekly (H4). The corresponding value for the rain-fed crop, which was able to resume active growth immediately after a rainfall event, following a prolonged dry period, was 7 t ha−1. The efficiency of conversion of PAR into dry matter (εs) was 2.74 g MJ−1 in the irrigated treatments combined, decreasing to around 73% of this without irrigation. The value of εs appeared not to be influenced by dry air or high temperatures. The reduction in εs due to drought was less than the corresponding reduction in intercepted PAR. Increasing the frequency of vine harvests increased the partitioning of assimilates to vines. Irrigation had similar effects early in the season, but afterwards it encouraged preferential growth of the storage roots. The end of season harvest index (h) for vines increased with harvesting frequency from, for example, 0.08 (H1) to 0.38 (H4) in the irrigated crop. By comparison, irrigation increased ‘h’ for storage roots from 0.24 (rain-fed) to 0.57 in the H1 treatment. The total harvest index (vines plus roots) increased with the number of vine harvests from 0.32 (H1) to 0.55 (H4) in the rain-fed crop, and from 0.62 (H1) to 0.72 (H4) in the irrigated crop. Clearly, ‘h’ is not a conservative parameter in the sweet potato, but is sensitive to crop management practices and to soil water availability.

Sign in / Sign up

Export Citation Format

Share Document