Submitted to: American Peanut Research and Education Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/2002
Publication Date: 12/15/2002
Citation: Puppala, N., Sorensen, R.B. 2002. Yield response of valencia peanut with different row orientations, nitrogen rates and rhizobium inoculum. American Peanut Research and Education Society Abstracts. Interpretive Summary: not required.
Technical Abstract: Peanut grown in the southeast with twin row orientation has shown an increase in yield and grade over conventional single row. Peanut farmers in New Mexico do not use rhizobium inoculum at the time of planting, but do apply high rates of nitrogen fertilizer (300 to 350 kg ha-1). A study was conducted at the South Research Facility (Clovis, NM) in 2001 to determine the pod yield of Valencia-C peanuts when planted with twin row orientation and at four different nitrogen and rhizobium treatments. The experimental design was a split plot with three replications. The main plot consisted of row pattern (single and twin) while the subplots consisted of four treatments of: a) control (C), b) nitrogen (N) at 200 kg ha-1, c) rhizobium (R) at recommended rate, and d) nitrogen plus rhizobium (NR). Single rows were centered on 100 cm row spacing. Twin rows were spaced 18 cm apart with each of the twin rows spaced 16 cm on each side of the 100 cm row center. Seed rate was the same for both single and twin row orientation (115 kg ha-1). Nitrogen (46-0-0) was applied to specified plots prior to planting using a Gandy box and the fertilizer was thoroughly incorporated. Cowpea strain of rhizobium was applied in the planter box at 70 grams ha-1. Plant chlorophyll was measured using a SPAD meter to estimate the relationship between leaf nitrogen and SPAD chlorophyll meter readings taken on 60, 90 and 120 DAP in the field. Pod yield with Twin row orientation averaged 4058 kg ha-1 or a 9% increase over single row planting (3735 kg ha-1). Among the four treatments tested, the combination of NR resulted in 22% increase in pod yield compared to C (3482 kg ha-1). Pod yield with just R was 15% higher compared with C but was not different than NR treatment. Applications of just N resulted in 11% increase in pod yield compared with the C. SPAD measurements at 90 days showed that the NR treatment were greater than all other treatments. The N and R treatments were similar but higher than C. Twin rows with R may be the best treatment for highest pod yields.