T. M. Wormer's research while affiliated with Coffee Research Foundation and other places

Publications (8)

Article
Stomatal aperture in irrigated and non-irrigated plants of Coffea arabica L. was studied by measuring the infiltration into the leaf of mixtures of iso-propanol and distilled water. In pot experiments, stomatal aperture proved to be closely related to soil moisture content. In the field, the coefficient of the correlation between stomatal aperture...
Article
The amount of starch in branches of Coffea arabica L. was studied by means of a method of visual scoring. In cropping branches, the variation in starch level was greatly, but not completely, determined by the growth of the crop. More knowledge of the formation and distribution of the products of photosynthesis is needed before a satisfactory explan...
Article
The nature of the soil, the influence of previous natural grassland, ley, fallow or cultivation, and the weather conditions before and after planting are shown to affect the yield of wheat, and its response to fertilizers, especially nitrogen. Out of seventeen experiments over four seasons, involving nitrogen top-dressings on wheat, thirteen gave e...
Article
Crinkle-leaf is an abnormal condition of the leaf of coffee in Kenya, the cause of which is unknown. Preliminary observations showed that its symptoms are suppressed by spraying with captan and experiments were carried out to investigate whether this material would provide an economic control. Spraying at the rate of 4 lb per acre, when symptoms of...
Article
The amount of starch in branches of Coffea arabica L. was studied by means of a method of visual scoring. In cropping branches, the variation in starch level was greatly, but not completely, determined by the growth of the crop. More knowledge of the formation and distribution of the products of photosynthesis is needed before a satisfactory explan...
Article
Crinkle-leaf is an abnormal condition of the leaf of coffee in Kenya, the cause of which is unknown. Preliminary observations showed that its symptoms are suppressed by spraying with captan and experiments were carried out to investigate whether this material would provide an economic coivtrol. Spraying at the rate of 4 lb per acre, when symptoms o...
Article
A method is described whereby starch level in wood of Coffea arabica L. was estimated by means of visual scoring. The correlation between the amount of starch thus found and the quantity established by chemical analysis proved to be + 0.925, +0.932 and 0.819 in young, semimature and mature wood respectively. No satisfactory way was found for making...
Article
In Kenya the coffee berry stays in the 'pin-head' stage for approximately 6-8 weeks after flowering. A period of rapid growth follows which ends when the berry is about 17 weeks old. Thereafter, a small loss of fresh weight seems to occur while the dry weight remains constant for about two weeks. At this stage the beans have attained their final si...

Citations

... A few investigators have already studied sugars in coffee leaves (DaMatta et al. 2008, Chaves et al. 2012, Marias et al. 2017, Avila et al. 2020, in coffee fruits (Ky et al. 2001 and in other organs (Nutman 1933, Wormer and Ebagole 1965, Patel 1970. Although Franck et al. (2006) showed an apparent autonomy of fruit-bearing branches for assimilates and a limitation of photosynthesis by low fruit demand, such autonomy was less obvious in the work of Chaves et al. (2012). ...
... As cinco fases geram um padrão de crescimento sigmoidal (Leon & Fournier, 1962;Salazar-Gutiérrez et al., 1994) que varia conforme as condições climáticas e altitude (Laviola et al., 2007). Essas variações também ocorrem em virtude das variáveis em estudo, da regularidade das medições, dos modelos estatísticos e a espécie em avaliação (Wormer, 1964;Salazar-Gutiérrez et al., 1994). Rena et al. (2001) sugerem que o padrão sigmoidal seja comum as espécies Coffea arabica e Coffea canephora. ...
... For example, in macadamia (Macadamia integrifolia Maiden & Betche), carbohydrate storage fluctuates rhythmically with growth flushes, and reproductive growth is heavily dependent on carbohydrate reserves (Cormack and Bate 1976, Stephenson et al. 1989a, 1989b). Coffee (Coffea arabica L.) fruit are dependent on both current photosynthates and reserve carbohydrates as evidenced by an accumulation of reserves after the spring flush followed by a depletion of reserves during fruit development (Wormer and Ebagole 1965, Patel 1970). The annual pattern of carbohydrate storage and mobilization in pistachio (Pistacia vera L.) is of interest, in relation to the alternate bearing cycle. ...
... A few investigators have already studied sugars in coffee leaves (DaMatta et al. 2008, Chaves et al. 2012, Marias et al. 2017, Avila et al. 2020, in coffee fruits (Ky et al. 2001, and in other organs (Nutman 1933, Wormer and Ebagole 1965, Patel 1970. Although Frank et al. (2006) showed an apparent autonomy of fruitbearing branches for assimilates and a limitation of photosynthesis by low fruit demand, such autonomy was less obvious in the work of Chaves et al. (2012). ...
... Some reports have suggested the importance of stomatal closure in restricting CO2 supply to the cell metabolism, especially under mild water stress (CORNIC, 2000), while other studies suggest that photosynthesis could be more straightforwardly limited by non-stomatal factors, specially through a direct effect of the drought upon the synthesis of ATP, therefore leading to a restricted ATP supply in the cells (TEZARA et al., 1999;LAWLOR;CORNIC, 2002). Besides, some studies also show that shoot growth rates can be restricted before there is any evidence of differential stomatal closure between irrigated and non-irrigated trees (WORMER, 1965). ...