Effects of leaf removal on yield components in sunflower.

Pereira, A. S.

doi:10.18174/njas.v26i2.17093

Cited by 7 publications

(6 citation statements)

References 3 publications

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“…Though not significant, it could be observed that higher levels of N, P, K and Cl were noted in the pruned palms compared to unpruned palms (Figure 6). This observation supports the earlier claims of Das Cupta (1972) and Pereira (1978) that when leaves are removed, the photosynthetic efficiency of the remaining leaves is improved. Likewise, Delting et al, (1979) and Heichel and Turner (1985) added that mobile nutrients such as N, S, K, and Cl as well as water become readily available to the remaining leaves.…”

Section: Effect Of Coconut Leaf Pruning Coffee Variety and Their Interaction On Leaf Nutrient Content Of Coconut And Coffeesupporting

confidence: 92%

Long-Term Coconut Leaf Pruning (Clp) Effects on Cbfs: Coconut-Coffee Agroecosystem

Canja¹,

Magat²,

Margate³

2003

CORD

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A long-term study on the response of ‘Laguna’ tall (LAGT) palms and coffee intercrop to coconut leaf pruning (CLP) was conducted at the PCA-Davao Research Center from 1993 to 2001 to determine the effect of coconut leaf pruning on the productivity of coconut + coffee cropping system. The coconut leaf pruning technique did not significantly affect the yield and nutrition of coconut in all the years of observation. However, lower number of nut and weight of copra per tree were observed on palms with CLP than those without CLP, but with a slight improvement in copra weight per nut. Likewise, CLP did not affect the coffee yield and leaf nutrient levels. Among the coffee varieties tested, the Excelsa had the highest green bean yield. The Robusta (Ivory Coast and Philippine strains) and Arabica had similar yield and crop nutritional status. While they had similar leaf N, K and B contents that were higher than that of Excelsa, they also had lower leaf levels of Ca, Cl and S. Coffee needs, 1,000-3,000 foot-candles of sunlight, which is within the available light transmission (1,750-4,050 foot-candles) under palms with and without CLP. Hence, CLP is not necessary anymore in coconut with coffee intercrop.

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Section: Effect Of Coconut Leaf Pruning Coffee Variety and Their Interaction On Leaf Nutrient Content Of Coconut And Coffeesupporting

confidence: 92%

Long-Term Coconut Leaf Pruning (Clp) Effects on Cbfs: Coconut-Coffee Agroecosystem

Canja¹,

Magat²,

Margate³

2003

CORD

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“…Findings of this work supports earlier claims of workers that when leaves are removed, likely the photosyn-thetic efficiency of the remaining leaves are improved (Das Cupta, 1972;Pereira, 1978); mobile nutrients (e.g. N, S, K and Cl) and water becomes readily available to the remaining leaves.…”

Section: Effect Of Leaf Pruning On Copra Yieldsupporting

confidence: 88%

Response of Coconut to Increasing Levels of Leaf Pruning and Its Implications on Farm Productivity

Magat¹,

Canja²,

Margate³

1994

CORD

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Effects on nut production and copra (wt/nut and yield/tree of four leaf pruning conditions (LP): control (no LP); LP from leaf 24; leaf 19 and leaf 14 with 31, 23, 18 and 13, remaining leaves on each palm, respectively, was studied on adult bearing palms at the Davao Research Center, Philippine Coconut Authority. As a reference point, leaf 1 is considered as the youngest expanded leaf, while leaf 19, the one supporting the 7‑8 month old developing nuts or buko. Except in the first year of LP of which nut and copra yields under all LP conditions were similar to the unpruned palms, the following second and third years of LP indicated that leaf pruning from leaf 19 or maintaining only the 18 younger, upper leaves of the tree crown strongly showed the capability of the coconut to still support the normal development and maturity of nuts. As a result of LP, sunlight transmission to intercrops increased by about 120% compared to unpruned palms. This was translated to higher intercrop yield of corn (2.16 t increased to 3.71 t/ha) which is strongly attributed to the average 4,000 ft candles of sunlight (190.5 PAR) observed with LP from leaf 19 and the rest of the leaves below. In relation to increased sunlight transmission, intercropping, water economy and drought tolerance, pest and disease control and added income from pruned leaves, implications of LP are pointed out.

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“…It was thought that these negative results were caused by the incorrect and incomplete application of the methods used in those researches. In some studies, all leaves in plant were removed [7][8][9], while 1/3 or 2/3 of leaves were removed in some other ones [9,10]. Or defoliation was carried out in the lower, middle, and upper leaves of the plants [11,12].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Leaf Removal–Based Physical Injury on High Seed and Crude Oil Yields in Sunflower (Helianthus annuus L.)

Yıldız¹,

Taher²,

Javani³

et al. 2018

Physical Methods for Stimulation of Plant and Mushroom Development

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Yield in agricultural production decreases due to biotic (diseases and pests) and abiotic (salinity, drought, high temperature, etc.) stress factors. Chemical methods have been widely used to fight against biotic stress factors. However, the use of chemicals in agriculture causes extra financial cost and environmental pollution. Improvement of high yielded cultivars via plant breeding methods does not seem to be adequate for meeting food demand of increasing population. That is why, the improvement of environmentally friendly new methods for high yield is obligatory. Leaves in plants form an active surface for photosynthesis. High photosynthetic activity affects yield directly by increasing matter production. The aim of this study was to increase seed and oil yields in sunflower via leaf defoliation. Oil-type sunflower cultivars used in the study, "08-TR-003," "TR-3080," and "TARSAN-1018," were obtained from the "Trakya Agricultural Research Institute." When plants reached to "star-shaped head stage," which is the beginning of the reproductive period, four different defoliation treatments were performed. They were control (no leaves removed), two leaves removed, four leaves removed, and six leaves removed. Half of the leaves were removed from just below the head, while the other half was removed from the middle part of the plant. After harvest, seed yield per plant, seed yield per decare, crude protein percentage, crude oil percentage, crude protein yield per decare, and crude oil yield per decare were determined. At the end of the study, it was observed that the application of defoliation, compared to the control, affected all characteristics positively.

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Effects of leaf removal on yield components in sunflower.

Cited by 7 publications

References 3 publications

Long-Term Coconut Leaf Pruning (Clp) Effects on Cbfs: Coconut-Coffee Agroecosystem

Long-Term Coconut Leaf Pruning (Clp) Effects on Cbfs: Coconut-Coffee Agroecosystem

Response of Coconut to Increasing Levels of Leaf Pruning and Its Implications on Farm Productivity

The Effect of Leaf Removal–Based Physical Injury on High Seed and Crude Oil Yields in Sunflower (Helianthus annuus L.)

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