Citation
Asiah A. M., . and Ramlan M. F., . and Tan S. A., . and Siti Aishah H., . and Mahmud T. M. Mohamed, . (2000) Calcium application to lettuces : effects on leaf nutrient concentrations and quality. [Proceedings Paper]
Abstract
Water stress or osmotic stress high atmospheric moisture and high temperatures often attribute to poor Ca absorption. In tropical climates such conditions easily prevail especially in the protected environmental structures. However by maintaining adequate supply of Ca in the root medium to certain levels could probably improve the absorption problems. Thus this experiment was conducted to determine the effects of Ca rates supplied to the root on leaf nutrient concentration and quality of lettuce grown in environmental protective structures. The experiment was conducted using NFT system. Five rates of Ca were used: 70 120 170 220 and 270 mgl-1 . Except for Ca all plants received the following nutrient concentrations mg.l-1 : 225 N 62 P 309 K 48 Mg 64 S 0.53 B 1.3 Mn 0.013 Cu 0.05 Zn and 0.11 Mo. Treatments were arranged in RCBD with 3 replications. The incidence of leaf tipburn was first detected on plants receiving 170 mgl-1 Ca 10.3 days after transplanting and the last was on plants grown at 270 mgl-1 Ca. However the highest percentage of plants affected by leaf tipburn was recorded at the highest Ca level. Though the specific leaf area and leaf chlorophyll content were not significantly affected the leaves were thicker at higher Ca. The ascorbic acid content was maximal at 170 mgl-1. The shelf life was longer with Ca rates. Plants were found to have high in nitrate and total N contents at lower Ca levels. Potassium P and Mg accumulations were not significantly affected by Ca supply. Calcium absorption was improved with additional Ca in the root media. Results indicate that Ca at 170 mgl-1 is sufficient for quality but for leaf tipburn incidence the lower Ca is probably needed.
Download File
Full text available from:
|
Abstract
Water stress or osmotic stress high atmospheric moisture and high temperatures often attribute to poor Ca absorption. In tropical climates such conditions easily prevail especially in the protected environmental structures. However by maintaining adequate supply of Ca in the root medium to certain levels could probably improve the absorption problems. Thus this experiment was conducted to determine the effects of Ca rates supplied to the root on leaf nutrient concentration and quality of lettuce grown in environmental protective structures. The experiment was conducted using NFT system. Five rates of Ca were used: 70 120 170 220 and 270 mgl-1 . Except for Ca all plants received the following nutrient concentrations mg.l-1 : 225 N 62 P 309 K 48 Mg 64 S 0.53 B 1.3 Mn 0.013 Cu 0.05 Zn and 0.11 Mo. Treatments were arranged in RCBD with 3 replications. The incidence of leaf tipburn was first detected on plants receiving 170 mgl-1 Ca 10.3 days after transplanting and the last was on plants grown at 270 mgl-1 Ca. However the highest percentage of plants affected by leaf tipburn was recorded at the highest Ca level. Though the specific leaf area and leaf chlorophyll content were not significantly affected the leaves were thicker at higher Ca. The ascorbic acid content was maximal at 170 mgl-1. The shelf life was longer with Ca rates. Plants were found to have high in nitrate and total N contents at lower Ca levels. Potassium P and Mg accumulations were not significantly affected by Ca supply. Calcium absorption was improved with additional Ca in the root media. Results indicate that Ca at 170 mgl-1 is sufficient for quality but for leaf tipburn incidence the lower Ca is probably needed.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. QK710.2 M239 2000 Call Number |
| AGROVOC Term: | Lettuces |
| AGROVOC Term: | Lactuca sativa |
| AGROVOC Term: | Leafy vegetables |
| AGROVOC Term: | Experiments |
| AGROVOC Term: | Absorption |
| AGROVOC Term: | Calcium |
| AGROVOC Term: | Nutrient solutions |
| AGROVOC Term: | Nutrient balance plants |
| AGROVOC Term: | Nutrient availability |
| AGROVOC Term: | Plant quality |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:15 |
| URI: | http://webagris.upm.edu.my/id/eprint/12747 |
Actions (login required)
 |
View Item |
