The existence of a Cooper minimum in the experimentally measured photoionization cross sections for the 7s 2 S 1/2 excited state of potassium has been reported using a two-step laser excitation technique in conjunction with a time-of-flight mass spectrometer. The photoionization cross sections for the 7s 2 S 1/2 state have been determined as (9.78 ± 0.01) × 10 −2 , (3.30 ± 0.49) × 10 −4 , (5.47 ± 0.82) × 10 −3 , and (2.06 ± 0.30) × 10 −2 Mb at the ionizing laser wavelengths 1064, 700, 532, and 355 nm, respectively, that validate the presence of a Cooper minimum at ∼ =1.25 eV above the first ionization threshold. The number density has been determined as N 0 = 2 × 10 11 cm −3 .The experimentally determined absolute values of the cross sections are in qualitative agreement with the theoretical predictions.

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The high cost and excess use of inorganic fertilizers are the important concerns for high and beneficial yield of common bean and at the same time the integrated crop management practices are the universal demands for agriculture and environment. Therefore, the research was carried out from June to September of 2018 in the botanical garden of Agriculture Faculty, Kabul University, Afghanistan to evaluate the influence of sole and combine application of diammonium phosphate (DAP) and Poultry Manure (PM) with different concentrations on the growth, yield and yield components of common bean. According to the results achieved, it was found that combination of 80 kg DAP ha -1 + 5 ton PM ha -1 improved the performance of common bean, with respect to 2272.33 kg grain yield (GY ) ha -1 over the alone used of DAP and PM (10 ton PM ha -1 , 130 kg DAP ha -1 , respectively) and control. In addition, the application of 5 ton PM + 80 kg DAP ha -1 showed positive effects on growth and yield attributes while no significant effects were observed on control (without any fertilizer application) for any trait of common bean. There were also strong positive correlations within the growth and yield components which indicate the importance for common bean GY. The present research showed that integrated application of DAP + PM is a good source of Phosphorus and other primary elements for the growth and yield performance of common beans.

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