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Assiut University (2017)

Effect of some pollination, thinning and potassium silicate treatments on fruiting of Saidy date palm under New Valley conditions

Samouni, Mona Taha Mohamed

Titre : Effect of some pollination, thinning and potassium silicate treatments on fruiting of Saidy date palm under New Valley conditions

Auteur : Samouni, Mona Taha Mohamed.

Etablissement de soutenance : Assiut University

Grade : Doctor of Philosophy (PhD) in Agricultural Sciences 2017

Résumé
This investigation was conducted in date palm Research Farm in Agricultural Research Station located at El-Kharga Oasis, New Valley Governorate, during the three successive seasons of 2013, 2014 and 2015 on thirty years old Saidy date palms cv. (as semi dry date palm cv.). The laboratory work of this study was conducted in Regional Agricultural Research Station of the New Valley. This study included three experiments. Thirty five healthy date palms were chosen and devoted for achieving these experiments. I- The first experiment : The objective of this experiment was examining the effect of spraying potassium silicate on fruiting of date palm Saidy cultivar during 2013, 2014 and 2015 seasons. Fifteen palms in the same age and uniform in growth and bearing of approximately the same number of spathes were selected. 1- Spraying water without potassium silicate (control). 2- 2.5 cm potassium silicate/ 1 L water. 3- 5 cm potassium silicate / 1 L water. 4- 10 cm potassium silicate/1 L water. 5- 20 cm potassium silicate/1 L water The previous spraying was five treatments with 3 replications, one palm per each. Spraying times was mid of May and until the first July. An average of every fifteen days (4 spraying). II- The second experiment : The objective of this experiment was examining the effect of some pollen grain sources on fruiting of date palm Saidy cultivar during 2013, 2014 and 2015 seasons. The experiment palms were chosen healthy, nearly uniform in vigour as possible and subjected to the some cultural practices commonly adopted in the orchard. The number of bunches per palm was adjusted to (10) bunches nearly equal in size by removing excess number from latest and earliest small ones. Six sources of pollen grains were used for this study. Male palms are grown at three different regions as follows : Assiut, El-Kharga and El-Dakhla. The male spathes were collected once spath cracking and strands were separated individually and dried at room temperature to avoid high moisture. Pollination treatments were hand pollination by inserting 7-10 strands/bunch. Pollinated spathes were immediately covered with paper bags to protect them from any foreign pollen grains and were released from the bags after 30 days from pollination time. Six female palms were selected and divided into 6 treatments in ten replicates, bunch each. Treatments were applied on the same palm and arranged in randomized complete block design. III- The third experiment : This study was carried out on nine palms with uniform vigour and in good physical condition, free of insect damage and diseases. The numbers of spathes per palm were adjusted to ten by removing excess earliest, latest and smallest. The retained bunches were thinned to a constant number of strands

Présentation étendue (EULC)

Page publiée le 5 janvier 2021