Effect of Phosphorus and Ryzelan on the Growth and Mineral Composition of Chickpeas
1975
Maftoun, M. | Bassiri, A.
Phosphorus uptake, accumulation, and distribution have received much attention due to the increasing importance of fertilizer P in crop production. However, information concerning herbicide and P interaction is limited and there is no report available about the effect of P on the phytotoxicity of 3,5-dinitro-N⁴,N⁴-dipropyl-sulfanilamide (Ryzelan). Therefore, the present study was undertaken to determine the effects of P and/or Ryzelan on the growth and mineral contents of chickpea (Cicer arietinum L.). Chickpeas were grown for 7 weeks in two arid region soils containing various levels of Ryzelan (O, 2 and 4 ppm) and P (0, 50 and 100 ppm). Dry matter yields and pant N, P, Ca, Mg, K, Na, and Fe contents were determined. Total N was determined by the micro-Kjeldahl method; P by the ammonium molybdate-stannous chloride method and Ca, Mg, K, Na, Fe, by atomic absorption spectrophotometer. Application of herbicide suppressed growth, decreased total N and P uptakes and delayed emergence of seedlings as compared with control. In general, growth was more adversely affected in Maharloo soil than that in Kooshkak soil and in the former soil root growth was restricted more than top growth by Ryzelan treatment. Addition of P increased the sensitivity of chickpeas to Ryzelan in Kooshkak. Moreover, application of P did not significantly affect plant height or dry weights in either soil, but increased total P uptake where no herbicide was added. Addition of Ryzelan increased the concentrations of N and P in the tops of chickpeas. The contents of Ca and Na by chickpeas were affected by P treatment and concentrations of K and Fe by Ryzelan treatment. Probably the unfavorable ratios of plant nutrients and/or the harmful influence of Ryzelan were the major factors which caused severe reduction of the dry matter yield.
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