Document Type : Research articles.
Authors
1
Soil, Water and Environment Research Institute (SWERI), Agricultural Research Center (ARC), Giza, Egypt.
2
Cotton Research Institutes , Giza , Egypt
Abstract
Two field experiments were performed in Agricultural Farm of Sids Agricultural Research Station , ARC ,Beni-Suef Governorate , Egypt (lat .290 04N, Long .310 ob E and 30-40 m above the mean sea level) To investigate the possibility of using nano- natural rock P instead of chemical superphsphate along humic acid on productivity of cotton as well as soil properties and fertility . The design of the experiment was split plot design , where humic acid treatments (without , 10kg/fed humic acid as soil application and 2 % foliar spraying twice of humic acid solution) were located in main plot , and phosphorus treatments (without , 15.5 kg P2O5 /fed , 31.0 kg P2O5 /fed and 2% foliar spraying twice of nano rock P solution ) were developed in subplots. The results indicated that soil properties and fertility did not affected by phosphorus treatments, except phosphorus availability ,which positively increased due to 15.5 or 31.0 kg P2O5 /fed as superphosphate .) On the other hand add in 10 kg/fed humic acid improved soil pH, OM,bulk density and soil available water as well as soil available N,P and K after cotton harvest in Foliar spraying of 2% nano rock P had equal effect of additions 31.0 kgP2O5 /fed , where it increased plant height, number of fermiting branches, searlinss % , number of open balls /plot , boll weight , seed indx , seed cotton yield as well as leaf cotton content of N,P,K and chlorophyll A and B. Humic acid application improved the above mentioned growth parameter yields and yield components and life cotton content , except earliness % , where 10 kg/fed humic acid as soil application surpassed added humic acid as foliar spraying. On the other hand lint% and fiber properties did not responded to humic acid or phosphorus application . The result of the interaction showed that the best treatment for Gisaas cotton antiwar production is 2% foliar spraying of nano rock P solution or 31kg/fed P2O5 + 10 kg /fed humic acid as soil application
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