RT Journal
T1 RESPONSE OF SORGHUM (Sorghum bicolor L.) FODDER TO PHOSPHORUS FERTILIZER ON TORRIPSAMMENT SOIL.
A1 M. Rashid
A1 M. Iqbal
JF Journal of Animal and Plant Sciences
JO JAPS
SN 1018-7081
VO 21
IS 2
SP 220
OP 225
YR 2011
FD 2011/04/01
DO DOI NA
AB <p>Sorghum is an important fodder for animals in Pakistan. Phosphorus is a quality nutrient for fodders. The use of P for sorghum is negligible. Thus a field study was conducted to evaluate the effect of model based P fertilization to improve yield and quality of sorghum fodder on Torripsamment soil (Loamy sand, calcareous). Adsorption isotherm was constructed by equilibrating 2.5 g soil with 25 ml of 0.01 M CaCl2 solution containing 0, 20, 40, 60, 80, 100, 200,300,400 and 500 &micro;g P mL-1 as KH2PO4 and shaking for 24 hour at 20 0C. P fertilizer doses were computed by using empirically derived Freundlich equation to adjust soil solution P levels of 0.05, 0.1, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, and 0.50 mg P L-1. It was observed that different P fertilizer doses were required to adjust different soil solution P levels. Adsorption of P increased with P application rate but marginal adsorption decreased significantly. Yield and quality of sorghum fodder were improved with P application. Yield increased upto T6 where P was applied @ 25 kg ha-1 but quality traits (P concentration, dry matter, crude protein, crude fiber and ash contents (%) improved with the highest rate of P use i.e. 43 kg ha-1. P application showed non-significant affect on NDF and ADF contents (%). External and internal P requirements of sorghum fodder to obtain 95 % relative yield were 0.22 mg L-1 and 0.20 % respectively.</p>
K1 - P fertilization, derived Freundlich equation, sorghum yield and quality.
PB Pakistan Agricultural Scientists Forum
LK https://thejaps.org.pk/AbstractView.aspx?mid=2011-JAPS-202