Effect Of Split Application Research Articles

Effect of split application of potassium on growth, yield and potassium accumulation by soybean

Field experiments were conducted during 1989 to 1991 on a loamy sand (Typic ustochrept) soil to study the K nutrition of soybean. Soybean responded significantly up to 50 kg K ha−1 when applied 1/2 of K at planting and 1/2 at flower initiation (two split) or applying 1/3 K at planting, 1/3 at flower initiation and 1/3 at pod development (three splits). Split application was more beneficial than applying full K at time of planting due to higher leaf area index, crop growth rate, chlorophyll content of fresh leaves, K accumulation in soybean and better agronomic and physiological efficiency of applied K. Agronomic efficiency, physiological efficiency and apparent recovery of K reduced as rate of applied K was increased from 50 to 75 kg ha−1. Highest K+ concentration (3.4 % of dry matter) was recorded in 30-day-old plants at 75 kg K ha−1 which depressed progressively with the age of the crop. At maturity, the K concentration of soybean seed varied from 1.5% (unfertilised K plants) to 2.1 % (when 75 kg K ha−1 was applied in three splits).

Timing sulfur applications for corn (Zea mays L.) production on irrigated sandy soil

Abstract The importance of sulfur (S) for corn (Zea mays L.) production on sandy soils has been noted for a number of years. Yet, there has been no extensive evaluation of the timing of S applications on corn production in these specific situations. This study was conducted for the purpose of measuring the effect of split applications of fertilizer S on com grown on irrigated sandy soils. The study was conducted in 1985 and 1986. Fourrâtes of fertilizer S (0, 6.5, 13, and 26 kg/ha) were combined with six times of application schemes in a randomized complete block design with four replications. Granular gypsum was used as the source of S. Corn responded to the use of fertilizer S in 1986 only. Time of application had no significant effect on yield in either year. There were no advantages to the use of split applications. The S concentration in the ear leaf tissue at silking was affected by both rate and time of S application at each experimental site. The current recommendation is to apply fertilizer S, wh...

Nitrogen fertilization of winter wheat in spring in Finland: comparison of calcium ammonium nitrate and calcium nitrate, and the effect of split application

The effectiveness of calcium nitrate (CN) and calcium ammonium nitrate (CAN) as N sources for winter wheat in spring was studied in seven field trials in Southern Finland, in the province of Uusimaa. The experiments were carried out on clay soils in 1986—1989. Nitrogen dressings of 120—150 kg ha-1 were broadcasted either as a single application or split into two applications. The two applications were in most cases 30—40 and 90 —110 kg ha-1. The single or the first split application was given in the beginning of the growing season and the latter application at the end of tillering. The grain yields obtained by a single N application of 140—150 kg ha-1 ranged from 2 610 to 7 550 kg ha-1 and the protein content of grains from 9.4 to 14.5 %. The nitrogen form of the fertilizer had no significant effect on the grain yield and on the protein content of grains. Splitting the nitrogen increased the grain yield by 400 kg ha-1 and the protein content of grains by 0.8 percentage points.

Effects of nitrogen application before sowing, compared with effects of split applications before and after sowing, for irrigated wheat on the Darling Downs.

On a nitrogen (N) deficient soil on the Darling Downs, yield of irrigated wheat was increased by the application of N as anhydrous ammonia at rates up to 150 kg/ha before sowing. Nitrogen applied at 150 kg/ha before sowing did not increase grain protein concentrations, 300 or 400 kg/ha of N being needed. Nitrogen applications before sowing and during tillering were usually more effective in promoting yield than dressings applied after tillering or applied as several suboptimal dressings between tillering and flowering. Tillering was enhanced by N applied either before sowing or during tillering, whereas application after tillering increased grain size and protein concentration in the grain. Split applications involving equal quantities of N applied to soil before sowing as anhydrous ammonia and to the foliage at tillering as urea solution produced similar grain yields as when the same amount of N was applied before sowing as anhydrous ammonia. Similarly split applications, when equal quantities of N were applied before sowing and after sowing at tillering and boot, were as productive as where all the N was applied before sowing. All urea foliar sprays caused leaf burning, which became evident the day after application. Split N applications were as effective as one application before sowing in increasing the quantity of N contained in grain and generally more effective in increasing the quantity of N in straw. Splitting the N application invariably increased grain protein concentration, and this would seem its chief advantage for irrigated wheat over applying all the N before sowing.

PHOSPHORUS UTILIZATION BY RICE (Oryza sativa L.) IN ALLUVIAL SOIL OF DELHI

Employing tracer techniques, the effects of split application and dipping of rice seed- ling roots in phosphate slurry on yield and P uptake parameters of rice were studied under field conditions on an alluvial soil of LA.R.I. Farm, New Delhi. Though yields were not influenced much, the P uptake parameters were considerably influenced by both the methods. Rice absorbed more P from DAP than from SSP under split application compared to full basal application, Results, with alternate tagging technique indicated that the fertilizer P uptake was higher from the basally applied portion than from the top dressed quantity. Though seed- ling root dipping in DAP slurry resulted in highest P utilization, this method was Inferior to soil application of P as the latter resulted in more fertilizer P uptake by rice crop when both methods were tried simultaneously.

Uptake of NPK and yield of rainfed groundnut (Arachis hypogaea L.)

Experiments were conducted on sandy loam soils of Tirupati campus of Andhra Pradesh Agricultural University for two rainy seaons of 1980 and 1981 to study the effect of split application of NPK fertilizers on Spanish bunch groundnut. The fertilizer doses were 40 N, 20 P and 40 K kg ha−1 in 1980 and 30 N, 10 P and 25 K kg ha−1 in 1981.

Effect of Split Application on N Uptake by Wheat from N15 Labelled Ammonium Nitrate and Urea

SUMMARYThe effect of split application of N on the uptake of N by wheat from N15 labelled ammonium nitrate and urea was studied in the field. Nitrogen fertilizers were applied at 120 kg N/ha in a single application (at seeding); two split applications (at seeding and tillering); and six split applications (at seeding, tillering, boot, heading, flowering and the milky stage). Nitrogen applied in two splits was most productive for grain yield for both the N sources, but six split applications significantly increased the protein content in grain compared with single or two split applications. The utilization of N from ammonium nitrate in grain was significantly higher than from urea when applied in six split applications.